Answer:
A phrase provides both a subject and a predicate.
Step-by-step explanation:
The options given are related to the definitions of the phrase and the general functions it serves. The most relatable and the appropriate function is the phrase is one which provides "both a subject and a predicate". The reader gets to understand the "context" of the message which the phrase suggests. The phrases can also be used in "other contexts" and more deeper meaning can be gained with the proper description of the predicate.