TASK DEFINITION: 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").
PROBLEM: A learned behavior is exhibited when a human displays that they can: (A) squinting in bright light (B) digesting food in the stomach (C) change a car tire (D) inhaling and exhaling during sleep

SOLUTION: C

PROBLEM: 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

SOLUTION: B

PROBLEM: Birds build nests out of things such as (A) fragments from plants (B) small glass shards (C) entire tree trunks (D) several flower buds

SOLUTION:
A