Answer:
I will go with the anwser c
In the summer of 1793 is
the group that contains the adverb phrases in the sentence.
To add, <span>an </span>adverb phrase<span> <span>consists of one or more words. The </span></span>adverb<span> <span>is the head of the </span></span>phrase<span> <span>and can appear alone or it can be modified by
other words.<span> </span></span></span>
