Which excerpt from billy collins’s “man listening to disc” best reflects the euphoric effect the narrator experiences from listening to music on his headphones?
a. his music flowing through the soft calipers
b. the pavement sparkling with sunlight
c. the music is loud yet so confidential
d. all i can say is watch your step

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.