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").

[Q]: A plane travels through what? (A) gas layers (B) plains (C) oceans (D) time
[A]: A


[Q]: Thick feathers can be used for (A) climbing, cracking nuts and peeling fruit skins. (B) courtship and looking for food (C) killing prey, preening and feeding young (D) staying weatherproof, flexible and free of bacteria
[A]: D


[Q]: Some birds find locations with (A) landmarks (B) road signs (C) eggs (D) magnetic patterns
[A]:
D