Which sentence uses quotation marks correctly?

A.
Amanda explained "that in painting, chiaroscuro is the dramatic use of light and dark to create strong contrasts."

B.
"What is chiaroscuro? asked Scarlet."

C.
"In art," said Carlos, "perspective is the illusion of depth on a flat surface."

D.
How is it possible "wondered Brigitte," to make paintings that look so realistic?