Select the correct subordinating conjunction to complete the sentence.
___________ he did to study for the final exam must have been helpful; his grade improved from a B to an A.
a)Which
b)That
c)So what
d)Whatever
___________ he did to study for the final exam must have been helpful; his grade improved from a B to an A.
a)Which
b)That
c)So what
d)Whatever