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").

Example Input: If one mineral can scratch another mineral then that other mineral is softer than that one mineral, as can be tested with (A) a diamond and steel (B) a rock and glass (C) a diamond and agate (D) a ruby and salt
Example Output: C

Example Input: Which acts as an insulator for electricity? (A) A metal ring (B) A battery (C) A door hinge (D) Beeswax
Example Output: D

Example Input: If a dog is hunting, then (A) it can sense whales nearby (B) it can sense toys around (C) it is getting tired (D) it can sense something using the olfactory
Example Output:
D