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]: Locusts historically always affect crops (A) in the sky (B) disadvantageously (C) near water (D) positively
[EX A]: B

[EX Q]: A person who wants to visit a desert will be sure to pack more (A) winter boots (B) thermal underwear (C) tan shorts (D) snowsuits
[EX A]: C

[EX Q]: Flashlights require batteries (A) to properly illuminate objects (B) to be used as a weapon (C) to meet weight requirements (D) to illuminate bright rooms
[EX A]:
A