Which definitive approach introduces an idea by stating what it is not?
a)negation
b)analysis
c)compare/contrast
d)origin

The best answer for this question would be:

A.) Negation

Because in stating a negation, it sometimes gives falsity in the preposition. In which it describes something actual that is not really there. Sometimes it can also identify of something opposite, that can evolve a situation to be positive.

The answer is !