Democritus Says That Sweet and Bitter Exist by Convention

Democritus says that sweet and bitter exist by convention. By this he means that

A) if we came to agree they didn't exist, they would disappear.
B) the words "sweet" and "bitter" (or their Greek equivalents) were agreed to by humans at a convention in Athens.
C) their nature depends as much on us as on the things themselves.
D) convention is an avenue into the real.