Q.)After the budget compromise, sixteen Republican senators issued press releases taking credit for the advances, although only one of the Democrats.

A)although only one of the Democrats
B)only one Democratic senator had
C)but of the Democrats, there was only one
D)of Democrats, only one senator had
E)although only one Democrat did

OA is E
I narrowed it down to C.
Can someone explain?

Thanks,
~Akshat