Fluent readers understand that pauses can communicate meaning when you eating you should pause after

d.

Explanation:

You should pause after asking both open-ended and rhetorical questions. Both are used to provoke thought, create interest and engage the audience. Pausing momentarily shows that what was just said is important. It gives the audience a little time to think about the question, and are more likely to remember it.

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.