Question

It's necessary to use a/an _______ when a quotation is introduced by a verb.

A. colon
B. comma
C. quotation mark
D. ellipse

Answer 1

B.comma because it explains that someone is saying something or already said something.

Answer 2

B. Comma

Take the example:
She said, "We will study later."
There is a comma after the verb.

Hope this helps :)