What is the best definition of a phrase?

A. A group of words with a subject and a verb; if removed, the sentence meaning is affected.

B. A group of words with a subject and a verb; if removed, the sentence meaning is not affected.

C. A group of words without a subject and a verb; if removed, the sentence meaning is affected.

D. A group of words without a subject and a verb; if removed, the sentence meaning is not affected.