Hmm, to make it parallel, I would say:
Lots of my friends think Prince's music is old, but I think it's not only excellent but also innovative.
Hypothetical evidence is based on speculation rather than on concrete facts. This is similar to a hypothesis in science.
The closest one I can see is answer D. The writer is asking you to imagine what would happen if leaders wrote their own speeches, instead of telling you what does and is known to happen when they do write their own speeches. (I hope that wasn't too confusing.)
4) A. Damaging
5) C. Produces
he is defending the blackman
