instruction:
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").
question:
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
answer:
A


question:
The national symbol for the US would most likely eat (A) roaches (B) birds (C) mosquitoes (D) salmon
answer:
D


question:
friction is used for stopping a vehicle by (A) running (B) singing (C) smelting (D) squeezing
answer:

D