Which element is required to set apart an introductory phrase?
a.
comma
b.
semicolon
c.
colon
d.
conjunction

Comma

Explanation:

Introductory clause gives the background information for the main part of the sentence and are found in the beginning of the sentence.  The main part of sentence is independent clause. Introductory clauses stat with adverbs like although, because , after, until and since. It is separated by the main clause with a comma.

Comma

Explanation:

Introductory clause gives the background information for the main part of the sentence and are found in the beginning of the sentence.  The main part of sentence is independent clause. Introductory clauses stat with adverbs like although, because , after, until and since. It is separated by the main clause with a comma.

electricity

so thats all folks

d.summerains, the last one