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").

As the pull of gravity decreases air molecules (A) explode (B) disperse (C) crowd together (D) party
B

Nerves are used to feel what on the skin? (A) creativity (B) stares (C) emotions (D) coldness
D

The respiratory system allows the body to (A) intake carbon dioxide into the blood from the air (B) oxygenate blood from the air (C) combine oxygen and carbon dioxide in the blood (D) remove oxygen from the blood

B