Why does Friar Laurence agree to unite Romeo and Juliet in marriage?

A.
He sees their union as proof that Romeo has forgotten his crush on Rosaline.

B.
He sees their union as an ordinary marriage, like others he has conducted.

C.
He sees their union as a way to unite their families and end the feud.

D.
He sees the union as a foolish but unavoidable choice.