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 Input:
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 Output:
A.

Ex Input:
Paragraph- Sent 1: (CNN) -- Horror-meister, Stephen King calls George Pelecanos "perhaps the greatest living American crime writer."Sent 2: His stories are set in Pelecanos' hometown of Washington, D.C., but this is not the side of the U.S. capitol that you see portrayed on TV with white marble monuments, lawyers and lobbyists.
Sent 3: Pelecanos is more interested in working families struggling to get by, the racial tensions in its ethnic neighborhoods and the low-lifes on the edges.
Sent 4: His crime-writing peers call Pelecanos the "undisputed poet" of Washington's gritty side.
Sent 5: The best-selling and award-winning author is out this week with his 17th and latest novel, "The Cut."Sent 6: It's the first in a new series featuring Iraq war veteran and private investigator Spero Lucas.
Sent 7: When he's not working for a Washington defense attorney, Lucas recovers stolen property for a 40% cut.
Sent 8: Now, a high-profile crime boss hires Lucas to find out who's been stealing from him, and it could turn out to be Lucas' biggest payday or an untimely end.
Sent 9: While Pelecanos made his bones in the noir tradition, there's a definite "Western" feel to "The Cut."Sent 10: The new novel takes place in a morally gray and often violent world.
Sent 11: It's peppered with pitch-perfect dialogue and captures the sights, sounds and taste of Washington in rich detail.
Sent 12: In short, Pelecanos reads like the real deal.
Sent 13: Pelecanos knows a thing or two about capturing the authenticity of urban America with an ethnically and socially diverse cast.
Sent 14: In addition to his success as a novelist, Pelecanos is a producer and writer for HBO's New Orleans-set, "Treme."Sent 15: He was previously a producer and Emmy-nominated writer on the hit series "The Wire" and the miniseries "The Pacific."Sent 16: Read an excerpt from "The Cut" CNN recently spoke to Pelecanos about his new novel.
Sent 17: The following is an edited transcript.
Sent 18: CNN: Tell me more about your new character, Spero Lucas.
Question: Who is the Iraq war veteran that works for an attorney? (A) Spero Lucas (B) Pelecanos (C) Chris O'Dowd (D) Sally Kups (E) Speros.

Ex Output:
A, E.

Ex Input:
Paragraph- Sent 1: Marsha loves playing with her noodle friend.
Sent 2: She had it for a long time so it is now a dark brown color.
Sent 3: When her mom first made it, it was white.
Sent 4: The night she met her noodle friend was spaghetti night.
Sent 5: Marsha's favorite dinner was spaghetti, which happened to be every Tuesday night.
Sent 6: On one Tuesday, a piece of spaghetti fell on the kitchen floor.
Sent 7: To Marsha, it looked like a stick man so she kept him.
Sent 8: She named her new noodle friend Joey and took him everywhere she went.
Sent 9: Sometimes Joey gets a little dried out so Marsha's mom told her to soak him in water every few days.
Sent 10: There were a couple times that the family dog, Mika, has tried to take Joey from Marsha and eat him!
Sent 11: So from now on, Marsha takes extra special care to make sure Joey is safe and sound at all times.
Sent 12: During the day she keeps him in a plastic bag in her pocket.
Sent 13: At night, she puts him under her pillow.
Sent 14: She loves Joey and wants to always be friends with him.
Question: What day of the week did Marsha first meet her friend? (A) Thursday (B) Sunday (C) Saturday (D) Tuesday.

Ex Output:
D.