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]: How long does it take Earth to fully revolve one time (A) 28 hours (B) 46 hours (C) 1400 minutes (D) 1440 minutes
[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]: What is a riverbank made of? (A) oceans (B) loam (C) rivers (D) dirty clothing
[EX A]:
B