Which sentence is punctuated correctly?

A.
Stacy asked "Did you know that Second City is turning fifty years old"?

B.
"Many of their performers," she went on to say, "have gone on to television and movies."<--this is my answer but I'm not sure if I'm right.

C.
"Second City" Stacy continued "is a famous comedy troupe from Chicago."

D.
"Oh, yes." said Stephen "I think I've seen some of them on TV."