Which word represents the subject of this sentence?

"because contrary to the wisdom of the bumper sticker,
it is not enough these days to simply question authority."

it
wisdom
days
authority

The word that represents the subject of the sentence is the pronoun "it".

Explanation:

The subject of the sentence is the person or thing doing the action or being described. The other basic part of a sentence is the predicate: It tells something about the subject. In this case, the sentence contains a simple subject since it is made up of one word without any modifiers.

a. the man as a ruler