You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.

[EX Q]: Paragraph- Sent 1: The inhabited history of the Las Vegas Valley stretches to 23,000 b.c.
Sent 2: , when much of the area was covered by a prehistoric lake.
Sent 3: During this period, the indigenous people lived in caves, hunting the mammals that gathered at the shoreline.
Sent 4: The landscape of the valley changed dramatically over the next 200 centuries.
Sent 5: The glaciers feeding the lake melted away and the lake evaporated.
Sent 6: Fossils tell an obscure story of man's slow and sporadic development.
Sent 7: Around 3000 b.c.
Sent 8: , native Archaic Indians began to develop a lasting hunting and gathering culture.
Sent 9: By this time, the valley was in much the same geographic state as it exists in today, with one exceptionthe presence of artesian springs that bubbled to the surface in several areas.
Sent 10: These springs fed a network of streams draining through the Las Vegas Wash to the Colorado River.
Sent 11: The areas surrounding the springs were desert oases: sprawling collections of grasses, trees, and wildlife.
Sent 12: Many springs lay in areas that would eventually become the center of the modern Las Vegas metropolis.
Sent 13: For about 4000 years, the Archaics thrived in a culture that included many signs of early civilization.
Sent 14: Signs of even more advancement appeared halfway through the first millennium a.d.
Sent 15: , when the Anasazi Indians inhabited the valley.
Sent 16: Far more progressive than the Archaics, the Anasazi utilized such formal agricultural techniques as irrigation to assist their harvest.
Sent 17: This permitted the Anasazi to achieve a benchmark of advanced societythe ability to live in permanent shelters year-round without need to follow wildlife.
Sent 18: Mysteriously, the Anasazi vanished from the valley around a.d.
Question: Approximately what year was the Las Vegas Valley covered by a prehistoric lake? (A) 23,000 b.c (B) 1500 b.c (C) Around 3000 b.c (D) 2000 b.c.
[EX A]: A.

[EX Q]: Paragraph- Sent 1: The center of an atom is held together by powerful forces.
Sent 2: This gives them a huge amount of stored energy.
Sent 3: This type of energy is called nuclear energy.
Sent 4: This energy can be released and used to do work.
Sent 5: This happens in nuclear power plants where they split apart the nucleus of an atom.
Sent 6: This splitting apart is called nuclear fission.
Sent 7: Another type of nuclear energy happens in the Sun.
Sent 8: Here the atoms nuclei are not split apart.
Sent 9: Instead, the nuclei of the atoms are fused, or joined together.
Sent 10: This process is called nuclear fusion.
Sent 11: Some of the suns energy travels to Earth.
Sent 12: This energy from nuclear fusion warms the planet and provides the energy for photosynthesis.
Question: How do nuclear fission and nuclear fusion differ? (A) Fission joins atoms nuclei (B) The nucleus splits in nuclear fission, but does not in nuclear fusion (C) Fusion comes from the moon and fission from the sun (D) Fission splits atoms nuclei (E) Fission fuses the nucleus and fusion splits the nucleus (F) Fusion joins atoms nuclei (G) Nuclear fission splits the nucleus and fusion fuses the nucleus (H) Fission causes photosynthesis and fusion doesn't (I) In nuclear fission, the nucleus of the atom is split apart. In nuclear fusion, atoms are fused, or joined together (J) Fusion splits atoms nuclei.
[EX A]: B, D, F, G, I.

[EX Q]: Paragraph- Sent 1: When Alexander destroyed Tyre, most of the towns on the route to Egypt quickly capitulated.
Sent 2: A later tradition recorded his entry into Jerusalem: according to Josephus, Alexander was shown the Book of Daniel's prophecy, presumably chapter 8, which described a mighty Greek king who would conquer the Persian Empire.
Sent 3: He spared Jerusalem and pushed south into Egypt.
Sent 4: However, Alexander met with resistance at Gaza.
Sent 5: The stronghold was heavily fortified and built on a hill, requiring a siege.
Sent 6: When "his engineers pointed out to him that because of the height of the mound it would be impossible... this encouraged Alexander all the more to make the attempt".
Sent 7: After three unsuccessful assaults, the stronghold fell, but not before Alexander had received a serious shoulder wound.
Sent 8: As in Tyre, men of military age were put to the sword and the women and children were sold into slavery.
Sent 9: Alexander advanced on Egypt in later 332 BC, where he was regarded as a liberator.
Sent 10: He was pronounced son of the deity Amun at the Oracle of Siwa Oasis in the Libyan desert.
Sent 11: Henceforth, Alexander often referred to Zeus-Ammon as his true father, and after his death, currency depicted him adorned with rams horn as a symbol of his divinity.
Sent 12: During his stay in Egypt, he founded Alexandria-by-Egypt, which would become the prosperous capital of the Ptolemaic Kingdom after his death.
Question: What happened to the citizens of Gaza? (A) Men of military age were put to the sword and the women and children were sold into slavery (B) Men and women were killed and children spared (C) Men were put to sword and women and children were sold for slavery.
[EX A]:
A, C.