Problem 1 - Olympiad

Which sentence uses the correct form of the verb?

A. She has ate all the cookies.B. She has eaten all the cookies.C. She have eaten all the cookies.D. She had ate all the cookies.

Correct: B

The present perfect tense requires the past participle 'eaten' and the auxiliary 'has' for third-person singular subjects. 'Ate' is simple past and cannot follow 'has/have.'