<span>The only place for the topic sentence is in the beginning as its purpose is to attract readers so that they would like to read a work till the end. So, to answer your question, the topic sentence should never be in the last lines, where the conclusion <span>of the whole work is written.</span></span>
The third one (I’m not sure if your question includes answers choices or not but if so , it is in fact (C)
Answer: C. to urge her audience to form a "national community
Explanation: I got it right on Edmentum