The last student who leaves the room must turn off the lights.The last student to turn off the lights leaves the room.The last student to be leaving the room must turn off the ligh...

A. The last student to turn off the lights leaves the room.

B. The last student to be leaving the room must turn off the lights.

C. The last student to leave the room must turn off the lights.

D. The last student to turn off the lights must leave the room.