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.

Example Input: Paragraph- Sent 1: American Airlines Flight 11: FAA Awareness.
Sent 2: Although the Boston Center air traffic controller realized at an early stage that there was something wrong with American 11, he did not immediately interpret the plane's failure to respond as a sign that it had been hijacked.
Sent 3: At 8:14, when the flight failed to heed his instruction to climb to 35,000 feet, the controller repeatedly tried to raise the flight.
Sent 4: He reached out to the pilot on the emergency frequency.
Sent 5: Though there was no response, he kept trying to contact the aircraft.
Sent 6: At 8:21, American 11 turned off its transponder, immediately degrading the information available about the aircraft.
Sent 7: The controller told his supervisor that he thought something was seriously wrong with the plane, although neither suspected a hijacking.
Sent 8: The supervisor instructed the controller to follow standard procedures for handling a "no radio" aircraft.
Sent 9: The controller checked to see if American Airlines could establish communication with American 11.
Sent 10: He became even more concerned as its route changed, moving into another sector's airspace.
Sent 11: Controllers immediately began to move aircraft out of its path, and asked other aircraft in the vicinity to look for American 11.
Sent 12: At 8:24:38, the following transmission came from American 11: American 11: We have some planes.
Sent 13: Just stay quiet, and you'll be okay.
Sent 14: We are returning to the airport.
Sent 15: The controller only heard something unintelligible; he did not hear the specific words "we have some planes."Sent 16: The next transmission came seconds later: American 11: Nobody move.
Sent 17: Everything will be okay.
Sent 18: If you try to make any moves, you'll endanger yourself and the airplane.
Question: How long was there between the flight failing to heed instructions and the transponder being turned off? (A) 9 minutes (B) 7 minutes (C) 7 Minutes (D) 11 minutes (E) 9 Miuntes (F) 1 minute.
Example Output: B, C.

Example Input: Paragraph- Sent 1: The driver of the Facel Vega car, Michel Gallimard, who was Camus's publisher and close friend, also died in the accident.
Sent 2: In August 2011, the Milan newspaper Corriere della Sera reported a theory that the writer had been the victim of a Soviet plot, but Camus's biographer, Olivier Todd, did not consider it credible.
Sent 3: Camus was buried in the Lourmarin Cemetery, Lourmarin, Vaucluse, France.
Sent 4: He was the second-youngest recipient, at the age of 44, of the Nobel Prize in Literature, after Rudyard Kipling, at the age of 42.
Sent 5: He was survived by his wife and twin son and daughter, Jean and Catherine, who hold the copyrights to his work.
Sent 6: Two of Camus's works were published posthumously.
Sent 7: The first, entitled A Happy Death (1970), featured a character named Patrice Mersault, comparable to The Stranger's Meursault.
Sent 8: There is scholarly debate as to the relationship between the two books.
Sent 9: The second was an unfinished novel, The First Man (1995), which Camus was writing before he died.
Sent 10: The novel was an autobiographical work about his childhood in Algeria.
Question: Which novel out of the two posthumous was unfinished? (A) An autobiographical novel about his adult life as a writer (B) Camus didn't have an unfinished novel that got published (C) A Happy Death (D) Friends (E) The First Man.
Example Output: E.

Example Input: Paragraph- Sent 1: What if two children push a swing at the same time?
Sent 2: Would the swing go higher?
Sent 3: Yes, together their force would be more.
Sent 4: It is common for forces to be combined.
Sent 5: Most objects on Earth have at least two forces acting on them.
Sent 6: Do you know what one of them is?
Sent 7: Of course, that force is gravity.
Sent 8: How many forces do you have on you right now?
Sent 9: Gravity pulls you down toward the center of Earth.
Sent 10: Your legs exert a downward force.
Sent 11: They hold you up against the pull of gravity.
Sent 12: Consider the example in Figure 1.3.
Sent 13: A book is resting on a table.
Sent 14: Gravity pulls the book downward.
Sent 15: It has a force of 20 newtons.
Sent 16: At the same time, the table pushes the book upward.
Sent 17: Its force is also 20 newtons.
Sent 18: The table opposes the pull of gravity.
Question: How many forces does an object have? (A) One (B) At least two (C) Two forces acting on it (D) 3.
Example Output:
B, C.