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]: When the old man was much younger, he still had (A) brown eyes (B) baldness (C) gray hair (D) wrinkled skin
[EX A]: A

[EX Q]: An electric car causes (A) more CO2 emissions (B) equal CO2 emissions (C) electric emissions (D) less CO2 emmissions
[EX A]: D

[EX Q]: Thick feathers come in handy for birds (A) that live in warm climates (B) who like a fluffier look (C) that live in frigid climates (D) who suffer from male patterned baldness
[EX A]:
C