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.

Input: Consider Input: Paragraph- Sent 1: (CNN) -- Cuba will pardon more than 2,900 prisoners, the government said Friday, though U.S. subcontractor Alan Gross is not among those who will be freed.
Sent 2: The decision to release the prisoners follows "numerous requests" from their family members and religious institutions, and is a humanitarian gesture, said Cuban President Raul Castro.
Sent 3: Among those who might be freed are prisoners over the age of 60, along with those who are sick, female or young with no previous criminal record.
Sent 4: With some exceptions, prisoners convicted of spying, terrorism, murder and drug trafficking will not be released.
Sent 5: Those who will be freed have already served a "important" part of their sentences and exhibited good behavior, according to an official statement published on the state-run website Cubadebate.
Sent 6: The jailed American, Gross, will not be among those pardoned, the Cuban Interests Section in Washington said.
Sent 7: Gross was jailed in December 2009, when he was working as a subcontractor on a U.S. Agency for International Development project aimed at spreading democracy.
Sent 8: Castro has accused him of importing satellite equipment to connect dissidents to the Internet, and this year Cuba's highest court upheld the 15-year sentence imposed on Gross for committing crimes against the security of the state.
Sent 9: He has maintained his innocence and said he was trying to help connect the Jewish community to the Internet.
Sent 10: Castro, speaking to the National Assembly, said that 86 prisoners from 25 countries would be among those released in coming days.
Sent 11: He cited the upcoming visit of Pope Benedict XVI as one of the motivations behind the move, which he said showed the "generosity and strength of the revolution."Sent 12: The pope has said he plans to visit Mexico and Cuba before Easter.
Question: Why was Alan Gross sentence to jail? (A) He was accused of drug trafficking (B) Castro accused him of importing satellite equipment to connect dissidents to the Internet (C) He was accused of committing crimes against the security of the state.

Output: B, C.

Input: Consider Input: Paragraph- Sent 1: From Babylon, Alexander went to Susa, one of the Achaemenid capitals, and captured its legendary treasury.
Sent 2: He sent the bulk of his army to the Persian ceremonial capital of Persepolis via the Royal Road.
Sent 3: Alexander himself took selected troops on the direct route to the city.
Sent 4: He had to storm the pass of the Persian Gates (in the modern Zagros Mountains) which had been blocked by a Persian army under Ariobarzanes and then hurried to Persepolis before its garrison could loot the treasury.
Sent 5: On entering Persepolis, Alexander allowed his troops to loot the city for several days.
Sent 6: Alexander stayed in Persepolis for five months.
Sent 7: During his stay a fire broke out in the eastern palace of Xerxes and spread to the rest of the city.
Sent 8: Possible causes include a drunken accident or deliberate revenge for the burning of the Acropolis of Athens during the Second Persian War.
Question: What are the possible causes of the fire that broke out in the eastern palace of Xerxes? (A) War (B) A drunken accident or deliberate revenge for the burning of the Acropolis (C) Spontaneous combustion (D) A drunken accident, or deliberate revenge (E) A drunken accident or revenge.

Output: B, D, E.

Input: Consider Input: Paragraph- Sent 1: The idea that Earth is a magnet is far from new.
Sent 2: It was first proposed in 1600 by a British physician named William Gilbert.
Sent 3: Knowing it acts like a magnet is one thing.
Sent 4: Knowing why it acts like a magnet is more difficult.
Sent 5: In fact, finding out why is a fairly recent discovery.
Sent 6: To find out why required new technology.
Sent 7: It was the seismograph that made it possible to learn why the Earth acted like a magnet.
Sent 8: Seismograph are used to study earthquakes.
Sent 9: By studying earthquake waves they were able to learn about Earths interior.
Sent 10: They discovered that Earth has an inner and outer core.
Sent 11: The outer core consists of liquid metals, mainly iron and nickel.
Sent 12: Scientists think that Earths magnetic field is generated here.
Sent 13: It is caused by the motion of this liquid metal.
Sent 14: The liquid metal moves as Earth spins on its axis.
Question: Why was William Gilbert unable to explain prove theory that the Earth acts like a magnet in 1600? (A) Knowing it acts like a magnet is one thing.
Sent 4: Knowing why it acts like a magnet is more difficult. To find out why required new technology (B) There was no appropriate technology (C) Gilbert could not prove his theory because seismograph technology required see the Earth's interior was not yet developed (D) Humanity was not ready to accept his explanation (E) Seismograph are used to study earthquakes.
Output: A, B, C.