Question

Which is true about phrases?

A- they can stand alone because they have subjects and verbs
B- they can't be connected to other phrases
C- they can't stand alone because they are missing a subject, a verb, or both

Answer 1

The answer which is true about phrases is that C. they can't stand alone because they are missing a subject, a verb, or both.
This is an example of a phrase:
having considered the problem carefully