Which of the underlined What- structures functions differently from the others?

Which of the underlined What- structures functions differently from the others?
A.A. What gave it an air of intensity was that Daisy lived there.
B.B. I have been impressed by what he presented.
C.C. Would you please translate into Chinese what's written on the blackboard?
D.D. What do you know about the coming contest?
正确答案：D. What do you know about the coming contest?