In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

Example Input: What is an example of reproduction occurring in adulthood? (A) humans are unable to reproduce until they are legal adults (B) eggs are unable to be fertilized before they are dropped (C) dogs are unable to have puppies until they are two years old (D) cats are unable to produce offspring until they are sexually mature
Example Output: D

Example Input: An example of an acquired characteristic is (A) the thickness of a horse's mane (B) the length of a horse's mane (C) the number of legs a horse has (D) the color of a horse's mane
Example Output: B

Example Input: A boy that has two legs and two arms has parents that have (A) nearly an arm and a leg (B) the same number limbs (C) their left arms only (D) one right leg each
Example Output:
B