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: Which is the least massive? (A) the Earth (B) the moon (C) the sun (D) the solar system

A: B
****
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: What typically occurs from a few seconds to under half of a minute? (A) an hour (B) an earthquake (C) a television series (D) a volcano

A:
B
****