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.)
C- it would be bias for answer A , many high school student don't have a personal trainer as well as blog posts are not reliable, and parents do not have experience the direct impact . Those are all the reason it can't be any of the others.
