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: In October 1933 Einstein returned to the U.S. and took up a position at the Institute for Advanced Study (in Princeton, New Jersey), noted for having become a refuge for scientists fleeing Nazi Germany.
Sent 2: At the time, most American universities, including Harvard, Princeton and Yale, had minimal or no Jewish faculty or students, as a result of their Jewish quota which lasted until the late 1940s.
Sent 3: Einstein was still undecided on his future.
Sent 4: He had offers from several European universities, including Oxford where he stayed for three short periods between May 1931 and June 1933, however in 1935 he arrived at the decision to remain permanently in the United States and apply for citizenship.
Sent 5: Einstein's affiliation with the Institute for Advanced Study would last until his death in 1955.
Sent 6: He was one of the four first selected (two of the others being John von Neumann and Kurt Godel) at the new Institute, where he soon developed a close friendship with Godel.
Sent 7: The two would take long walks together discussing their work.
Sent 8: Bruria Kaufman, his assistant, later became a physicist.
Sent 9: During this period, Einstein tried to develop a unified field theory and to refute the accepted interpretation of quantum physics, both unsuccessfully.
Question: How many years was Einstein affiliated with the Institute for Advanced Study? (A) Over 20 years (B) 22 years (C) 20 years (D) 2 years.
Example Output: B, C.

Example Input: Paragraph- Sent 1: Speed is an important aspect of motion.
Sent 2: It is a measure of how fast or slow something moves.
Sent 3: To determine speed you must know two things.
Sent 4: First, you must know how far something travels.
Sent 5: Second, you need to know how long it takes to travel that far.
Sent 6: Speed can be calculated using this formula: speed = distance time A familiar example is the speed of a car.
Sent 7: In the U.S., this is usually expressed in miles per hour.
Sent 8: Think about a trip you and your family made in the car.
Sent 9: Maybe the trip covered 120 miles and it took 3 hours.
Sent 10: What was the cars speed?
Sent 11: speed = 120 mi = 40 mi/h 3h The speed of a car may also be expressed in kilometers per hour (km/h).
Sent 12: The SI unit for speed is meters per second (m/s).
Sent 13: This is the unit of measure a scientist would use.
Question: What is speed? (A) How long it takes to travel that far (B) Speed is an important aspect of motion (C) The measure of gravity against time (D) It is a measure of how far something is (E) Gravitational pull (F) When something moves (G) A force of gravity (H) How far something travels (I) An aspect of motion, it is the measure of how slow or fast something travels (J) How quick something moves in space (K) It is a measure of how fast or slow something moves (L) A measure of how fast or slow something moves (M) The measure of motion (N) An aspect of motion; a measure of how fast or slow an object moves.
Example Output: B, I, K, L, N.

Example Input: Paragraph- Sent 1: LONDON, England (CNN) -- The most eagerly anticipated animated film this year hits big screens this weekend, as "The Simpsons Movie" opens worldwide.
Sent 2: The Screening Room spoke to creator Matt Groening and writer Al Jean in London about everyone's favorite two-dimensional yellow family.
Sent 3: Simpsons supremo Matt Groening with his creations at the film's premiere in Springfield, Vermont Matt Groening told the Screening Room that fans had driven the demand for the movie.
Sent 4: "We've had fans clamoring for a movie for the past 18 years," he said.
Sent 5: The film has taken four years to come to fruition, as writer Al Jean explained.
Sent 6: "What really held us up for a long time was to have enough people to do the show and the movie," he said.
Sent 7: "We talked for a while about doing the movie after the show is done, but the show is never done!
Sent 8: So it really started in earnest in 2003, when we started working on this story that became the movie."Sent 9: Technology has also played its part.
Sent 10: Jean continued, "The technology to do this film really wasn't even around five years ago.
Sent 11: For example, there was this joke I once pitched and David Silverman, the director, started drawing and as I was pitching it, it went into the film and it was cut a day later.
Sent 12: To go from pitch to cut in two days is pretty impressive."Sent 13: Its creators hope that "The Simpsons Movie" will both satisfy long-term fans and bring Homer and Marge's family to a new audience.
Sent 14: Groening told the Screening Room, "This movie is designed to both honor the people who have loved the show all this time, so there's lots of little details for them in the movie, little characters and stuff who they know and love, but we also want people who don't know the family to not be completely confused.
Sent 15: It is a complete movie experience, but again, we have a lot of little details that only the really, true die-hard fans are going to get."Sent 16: And fans can expect to be entertained by plenty of cartoon mishaps.
Sent 17: Groening said, "When you see somebody fall off the roof in a live-action film, it's funny -- we all love it.
Sent 18: But it's not as funny as when Homer falls off the roof.
Question: Was "What really held us up for a long time was to have enough people to do the show and the movie" said by the creator of the movie? (A) No. (It was said by the writer.) (B) Yes (C) Maybe.
Example Output:
A.