I wonder what our teacher will say

[Volcano1985]

I wonder what our teacher will say when she realizes that we worked together on our research projects.

A) I wish I knew whether or not our teacher will approve of our cooperation on the research projects.

B) I am sure our teacher will be angry when she finds out that we worked together to finish the research projects.

C) Our teacher will certainly understand that we cooperated on our research projects; what do you think her reaction will be?

D) When our teacher discovered that we cooperated on our research projects, what did she say?

E) Do you think our teacher will let us work together on our research projects when we ask her

Could you explain me why C, why not A?

[Bullet_Bang]

D and E are errorneous for sure. B is not another form of the question.It answers the question.

Key phrase " what our teacher will say" in the question is replaced by ""whether or not our teacher will approve" in answer A and by "what do you think her reaction will be?" in Answer C.
Like wise, Key phrase "when she realizes" is not mentioned in Answer A but is implied by the phrase " will certainly understand" in answer C . Therefore I would have gone for the Answer C.

Forgive my grammatical mistakes.