Which of the following italicized parts is used as an adverbial？A．Who do you think the man

Which of the following italicized parts is used as an adverbial？

A．Who do you think the man in white is？

B．How much bread is there on the table？

C．How often did you say he visits his grandpa？

D．How much did you pay for the English grammar book？

请帮忙给出正确答案和分析，谢谢！