Multiple Choice Question

Which of the following sentences is punctuated correctly?
A.
At the morning assembly the fifth grade math team received medals of honor.

B.
At the morning assembly the fifth grade math team, received medals of honor.

C.
At the morning, assembly the fifth grade math team received medals of honor.

D.
At the morning assembly, the fifth grade math team received medals of honor.

D.

At the morning assembly, the fifth grade math team received medals of honor.