First, punctuation in a quotation is always inside the double quotes ruling out option B. Then, before you write a quotation you must include a comma after the intro clause. Thus, C is the only right answer.
C. No capitals must be used after semi-colons. Also a noun ending with an 's' should not uses another 's' after an apostrophe. So it cannot be: The two girls's. It can only be: The two girls'