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quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.

idk

explanation:

the two sonnets of sidney most closely follows the division between the octave and the sestet are the astrophel and stella sonnets.