—What is the matter with Mary?

—______.

 [ ]

A. She is a student.

B. She is reading.

C. She has a bad cold.

要约过程中存在的法律风险有（）。

A.要约的撤销不当

B.将要约误认为要约邀请

C.要约的撤回不当

D.要约内容不当