50 Points Will Be Given With Correct Answer! Read the two sentences.
he completed his assignment. Then he submitted it to his teacher.
Which sentence combines the two sentences using a past participle?
A. He submitted the completed assignment to his teacher.
B. He completed the assignment and then submitted it to his teacher.**
C. Before he submitted it to his teacher, he completed his assignment.
D. He submitted the assignment to his teacher after he completed it.

If this is not right please tell me the answer