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").

Factories often add something to the environment that is (A) helpful (B) productive (C) sanitizing (D) posionous
D

Which process does the slate that comes from shale come from? (A) height (B) compression (C) gravity (D) steel
B

There will be more rattlesnakes if a rattlesnake has (A) more scales (B) more eggs (C) more venom (D) more rattles

B