Answer:
A
Step-by-step explanation:
The answer is a. A part of a sentence that needs support of other components to make complete grammatical sense.
When trying to determine the meaning of a phrase, it is often helpful to look at the context in which it appears. A phrase may be a standalone sentence that makes complete grammatical sense (option b), but more often than not, it is part of a larger sentence or paragraph that provides context and additional information.
Therefore, a phrase that needs the support of other components to make complete grammatical sense is the best answer for this question.