C. They provide additional detail for the presenter to use as speaking cues is the correct answer.
He should have a good hook in place and then have a good connective bridge before writing the thesis on the paper.
I hope this helps.
We can't see underlining here, but here, I think this will be helpful:
"I read a novel" would be the intependent clause: it does not need the other one to be complete.
"until the guests arrived" is the subordinate clause: it needs the independent, main clause to be complete.
The usage if vast in this passage means large, therefore the answer is A.
