Correct the punctuation in this​ sentence:

​"The Beatles are still my favorite​ band, Charles​ said."

A.

​"The Beatles are still my favorite band. Charles​ said."

B.

The Beatles are still my favorite​ band, Charles said.

C.

​"The Beatles are still my favorite​ band," Charles said.

D.

​"The Beatles are still my favorite​ band, Charles said.