Question

the molecules that make up a plastic two - liter bottle
a are in constant, rapid, random motion.
b have a volume of more than two liters if melted.
c expand to take the shape of wherever the bottle is placed.
d are closer together than the molecules of soda that they contain.

Explanation:

According to the kinetic - molecular theory, molecules of any substance (including those in a plastic bottle) are in constant, rapid, random motion. Solids like plastic have a fixed shape and volume, so they don't expand to take the shape of their container like gases, and melting a two - liter plastic bottle won't necessarily result in a volume greater than two liters. Also, the molecules in a solid (plastic) are generally more closely packed than in a liquid (soda), but the key concept here is molecular motion.

Answer:

A. are in constant, rapid, random motion.