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
He had completed the report. He submitted it to the manager
A. Completing the report, it was submitted to the manager.
B. Have completed the report, it was submitted to the manager.
C. Having completed the report, he submitted to the manager.
D. Having completed the report, he submitted it to the manager