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]: Which likely most relies on its looks to reproduce? (A) the shark (B) the horse (C) the spider (D) the peacock
[EX A]: 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]: Using mirrors to focus collected light from heavenly bodies allows (A) detailed observation (B) foregone conclusions (C) radiation experiments (D) celestial music
[EX A]:
A