Given the task definition, example input & output, solve the new input case.
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: Paragraph- Sent 1: Obama was born on August 4, 1961, at Kapiolani Maternity & Gynecological Hospital in Honolulu, Hawaii.
Sent 2: He is the only President to have been born in Hawaii.
Sent 3: He was born to a white mother and a black father.
Sent 4: His mother, Ann Dunham (1942-1995), was born in Wichita, Kansas, of mostly English descent, with some German, Irish, Scottish, Swiss, and Welsh ancestry. Question: How old was Obama's mother when he was born? (A) teenager (B) in his 40s (C) mid 20s (D) almost twenty.
Output: D.
Obama was born in 1961. His mother was born in 1942 and 1961-1942=19. Therefore, "almost twenty" answers the question sufficiently.

New input case for you: Paragraph- Sent 1: You approach the door of your friends house.
Sent 2: What is the first thing you do before entering?
Sent 3: Of course, you wipe your feet.
Sent 4: You are a thoughtful visitor.
Sent 5: Fortunately, there is a nice piece of carpet by the door to wipe your shoes.
Sent 6: Too bad your caring comes at a price.
Sent 7: After wiping your feet on the mat you reach out to touch the brass knocker on the door.
Sent 8: A spark suddenly jumps between your hand and the metal.
Sent 9: You feel an electric shock.
Sent 10: Why do you think an electric shock occurs?
Sent 11: An electric shock occurs when there is a sudden discharge of static electricity.
Sent 12: Has this ever happened to you?
Sent 13: You reached out to touch a metal doorknob and received an unpleasant electric shock?
Sent 14: The reason you get a shock is because of moving electric charges.
Sent 15: Moving electric charges also create lightning bolts.
Sent 16: It is also the same reason electric current flows through cables and wires.
Question: You get shocked because of moving electric charges and moving electric charges also creates what? (A) Lightning bolts (B) Lightening bolts (C) Lightning (D) Irritation (E) Pain (F) Water to rise (G) Earthquake (H) Fire (I) Short circuit (J) Bolts.
Output:
A, B, C, J.