Select the correct indirect form of the given sentence.
The supervisor said to the staff, "Make sure that every room is disinfected properly."

A

The supervisor instructed the staff to make sure that every room had been disinfected properly.

B

The supervisor instructed the staff to make sure that every room was being disinfected properly.

C

The supervisor instructs the staff to make sure that every room is disinfected properly.

D

The supervisor instructed the staff to make sure that every room was disinfected properly.