An Odor, Such as the Odor of Bread, Is Due

An odor, such as the odor of bread, is due to

A) individual atoms that detach from the source and diffuse individually through the air.
B) an electromagnetic wave emitted by the source [the bread].
C) molecules that detach from the source and diffuse through the air.
D) a pressure wave, similar to a sound wave, emitted by the violets.
E) cosmic vibrations emanating from the Great Pumpkin.