Answer:
Your answer would be B.
Step-by-step explanation:
The group of words that is not a phrase is B. It contains a sentence because the group of words has a subject and a predicate. A sentence is the basic unit of language that represents a complete thought. It contains at least a subject and a main verb that the states what the subject does/is. In the sentence above, the subject of the sentence is the NP she and the predicate is the VP because smiled at me. This sentence could be the answer to a question asking why.