A waitress served us. She was very impolite...

Câu hỏi: A waitress served us. She was very impolite and impatient.

A. A waitress, who served us, was very impolite and impatient

B. A waitress, which served us, was very impolite and impatient

C. A waitress who served us was very impolite and impatient

D. A waitress whom served us, was very impolite and impatient