Question: Hermodorus, lived in the 4th century BC, is said to have circulated the works of which Classical Greece philosopher ?

Context paragraphs:
Ancient Greek: Ancient Greek includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD.  It is often roughly divided into the Archaic period (9th to 6th centuries BC), Classical period (5th and 4th centuries BC), and Hellenistic period (3rd century BC to the 6th century AD).  It is antedated in the second millennium BC by Mycenaean Greek.

Classical Greece: Classical Greece was a period of around 200 years (5th and 4th centuries BC) in Greek culture.  This Classical period saw the annexation of much of modern-day Greece by the Persian Empire and its subsequent independence.  Classical Greece had a powerful influence on the Roman Empire and on the foundations of western civilization.  Much of modern Western politics, artistic thought (architecture, sculpture), scientific thought, theatre, literature, and philosophy derives from this period of Greek history.  In the context of the art, architecture, and culture of Ancient Greece, the Classical period, sometimes called the Hellenic period, corresponds to most of the 5th and 4th centuries BC (the most common dates being the fall of the last Athenian tyrant in 510 BC and the death of Alexander the Great in 323 BC).  The Classical period in this sense follows the Archaic period and is in turn succeeded by the Hellenistic period.

Plato: Plato ( ; Greek: Πλάτων "Plátōn", ] in Classical Attic; 428/427 or 424/423 – 348/347 BC) was a philosopher in Classical Greece and the founder of the Academy in Athens, the first institution of higher learning in the Western world.  He is widely considered the most pivotal figure in the development of philosophy, especially the Western tradition.  Unlike nearly all of his philosophical contemporaries, Plato's entire work is believed to have survived intact for over 2,400 years.  Others believe that the oldest extant manuscript dates to around AD 895, 1100 years after Plato's death.  This makes it difficult to know exactly what Plato wrote.

Dexippus of Cos: Dexippus of Cos (Greek: Δέξιππος ὁ Κῷος ; 4th century BC), also called Dioxippus, was a Greek physician of Cos, who was one of the pupils of the celebrated Hippocrates, and lived in the 4th century BC.  Hecatomnus, prince of Caria (385-377 BC), sent for him to cure his sons, Mausolus and Pixodarus, of a dangerous illness, which he undertook to do upon condition that Hecatomnus should cease from waging war against his country.  He wrote some medical works, of which nothing but the titles remain.  He was blamed by Erasistratus for his excessive severity in restricting the quantity of drink allowed to his patients.  He is quoted by Plutarch, and Aulus Gellius, in the controversy that was maintained among some of the ancient physicians as to whether the drink passed down the windpipe or the gullet.

Hermodorus: Hermodorus (Greek: Ἑρμόδωρος ), who lived in the 4th century BC, is said to have circulated the works of Plato, and to have sold them in Sicily.  Hermodorus himself appears to have been a philosopher, for we know the titles of two works that were attributed to him: "On Plato" (Greek: Περὶ πλάτωνος ), and "On Mathematics" (Greek: Περὶ μαθημάτων ).

Ancient Greece: Ancient Greece was a civilization belonging to a period of Greek history from the Greek Dark Ages of the 12th-9th centuries BC to the end of antiquity (  600 AD).  Immediately following this period was the beginning of the Early Middle Ages and the Byzantine era.  Roughly three centuries after the Late Bronze Age collapse of Mycenaean Greece, Greek urban poleis began to form in the 8th century BC, ushering in the period of Archaic Greece and colonization of the Mediterranean Basin.  This was followed by the period of Classical Greece, an era that began with the Greco-Persian Wars, lasting from the 5th to 4th centuries BC.  Due to the conquests by Alexander the Great of Macedonia, Hellenistic civilization flourished from Central Asia to the western end of the Mediterranean Sea.  The Hellenistic period came to an end with the conquests and annexations of the eastern Mediterranean world by the Roman Republic, which established the Roman province of Macedonia in Roman Greece, and later the province of Achaea during the Roman Empire.

Greece in 5th century BC: The period of the 5th century BC in classical Greece is generally considered as beginning in 500 and ending in 404, though this is debated.  This century is essentially studied from the Athenian viewpoint, since Athens has left us more narratives, plays and other written works than the other Greek states.  If one looks at Athens, our principal source, one might consider that this century begins in 510, with the fall of the Athenian tyrant and Cleisthenes's reforms.  If one looks at the whole Greek world, however, we might place its beginning at the Ionian revolt in 500, that provoked the Persian invasion of 492.  The Persians (called "Medes") were finally defeated in 490.  A second Persian attempt failed in 481-479.  The Delian League then formed, under Athenian hegemony and as Athens' instrument.  Athens' excesses caused several revolts among the allied cities, which were all put down by force, but Athenian dynamism finally awoke Sparta and brought about the Peloponnesian War in 431.  After both sides were exhausted, a brief peace occurred, and then the war resumed to Sparta's advantage.  Athens was definitively defeated in 404, and some internal Athenian agitations ended the 5th century in Greece.

Philiscus of Aegina: Philiscus of Aegina (Ancient Greek: Φιλίσκος Αἰγινήτης ; 4th century BC) was a Cynic philosopher from Aegina who lived in the latter half of the 4th century BC.  He was the son of Onesicritus who sent Philiscus and his younger brother, Androsthenes, to Athens where they were so charmed by the philosophy of Diogenes of Sinope that Onesicritus also came to Athens and became his disciple.  According to Hermippus of Smyrna, Philiscus was the pupil of Stilpo.  He is also described as an associate of Phocion.  The "Suda" claims that he was a teacher of Alexander the Great, but no other ancient writer mentions this.  Aelian, though, has preserved a short exhortation by Philiscus addressed to Alexander:

Roman conquest of the Hernici: The Roman conquest of the Hernici, an ancient Italic people, took place during the 4th century BC.  For most of the 5th century BC, the Roman Republic had been allied with the other Latin states and the Hernici to successfully fend off the Aequi and the Volsci.  In the early 4th century BC, this alliance fell apart.  A war fought between Rome and the Hernici in the years 366 - 358 BC ended in Roman victory and the submission of the Hernici.  Rome also defeated a rebellion by some Hernician cities in 307 - 306 BC.  The rebellious Hernici were incorporated directly into the Roman Republic, while those who had stayed loyal retained their autonomy and nominal independence.  In the course of the following century, the Hernici became indistinguishable from their Latin and Roman neighbours and disappeared as a separate people.

Xenophilus: Xenophilus (Greek: Ξενόφιλος ; 4th century BC) of Chalcidice, was a Pythagorean philosopher and musician, who lived in the first half of the 4th century BC.  Aulus Gellius relates that Xenophilus was the intimate friend and teacher of Aristoxenus, and implies that Xenophilus taught him Pythagorean doctrine.  He was said to have belonged to the last generation of Pythagoreans, and he is the only Pythagorean known to have lived in Athens in the 4th century BC.  We learn from Diogenes Laërtius that Aristoxenus wrote that when Xenophilus was once asked by someone how he could best educate his son, Xenophilus replied, "By making him the citizen of a well-governed state."  According to Pseudo-Lucian, Aristoxenus is supposed to have said that Xenophilus lived 105 years.  Xenophilus enjoyed considerable fame in the Renaissance, apparently because of Pliny's claim that he lived 105 years without ever being sick.

Supporting paragraphs: Hermodorus Plato
Answer: Plato