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").

[EX Q]: The moon's surface (A) features of variety of landscape features (B) is covered completely in water (C) is 100% flat and smooth (D) is 100% covered in asteroid created craters
[EX A]: A

[EX Q]: 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
[EX A]: C

[EX Q]: Which is least likely to be an ecosystem? (A) the plains (B) the moon base (C) the desert (D) the fields
[EX A]:
B