In which sentence is the underlined verb in the passive voice?

Taro HAS BEEN APPOINTED to the committee by the principal.
Lynn HAS BEEN STUDYING all evening for the science test.
On Saturday mornings he always COOKS pancakes for breakfast.
She HAS BEEN TRYING to improve her golf score.

Question

In which sentence is the underlined verb in the passive voice?
 	
	Taro HAS BEEN APPOINTED to the committee by the principal.
	Lynn HAS BEEN STUDYING all evening for the science test.
	On Saturday mornings he always COOKS pancakes for breakfast.
	She HAS BEEN TRYING to improve her golf score.

anonymous · Answer

I believe it to be C since cooking is the verb

anonymous · Answer

Yes I think the answer may be C. Also the setting words can give you hints.