Knowing the function of the parts of speech is not necessary for communicating clearly

False because if you don't know the part of speech then you wont how to correctly or fully understand what the conversation.

the answer is somber

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.