Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
A waitress served us. She was very impolite and impatient.
A.A waitress served us was very impolite and impatient.
B.A waitress to serve us was very impolite and impatient.
C.A waitress to be served us was very impolite and impatient.
D.A waitress serving us was very impolite and impatient.