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").

[Q]: When cutting down rain forests, it is important to keep in mind air quality. When too many trees are cut down in a given area, there may be decrease in the air's (A) quality (B) carbon dioxide (C) helium amounts (D) carbin dioyide levels
[A]: A


[Q]: You can find ferrous metals in (A) Grass (B) Vehicle scraps (C) Wood (D) Glass
[A]: B


[Q]: An animal species' population may decrease because of (A) construction activity (B) mating (C) more food (D) growth
[A]:
A