Choose the sentence that is correctly punctuated.
A.
The main campus of the University of Maryland, which is near Washington, D.C. offers many cultural activities.
B.
The main campus of the University of Maryland, which is near Washington, D.C., offers many cultural activities.
C.
The main campus of the University of Maryland which is near Washington, D.C., offers many cultural activities.
D.
The main campus of the University of Maryland which is near Washington, D.C. offers many cultural activities.