1.Why might a teacher be happy to hear her students disagree about whether a particular novel is worth reading? A. Different perspectives help students understand the book.
B. The argument means they actually read the book.
C. Students should care about the books they’re assigned.
D. When students argue, teachers can take a break.

C or B

Explanation:

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.