Answer:
The answer is B.
Explanation:
Prepositional phrase is a type of phrase where the main word is a preposition.
For example: Into the void.
It modifies a verb or a noun.
It consists of at least a preposition which is usually the first word in the phrase and the object which is usually a noun or a pronoun. So in these sentences, prepositional phrase is to the concert.
In sentence, A phrase to the concert is a part of independent clause (We went to the concert)
In sentence B phrase to the concert is a part of a dependent clause(a sentence which can not stand alone); ( If we don't go to the concert)
In sentence C phrase to the concert is a part of independent clause ( You didn't go to the concert)
