Do you think this is a complete model of what happened during the chemical reaction? Yes
No

Explain your answer. Describe why the model is either complete or incomplete chemical reaction?

the answern should be b, if it is the part where the mob has gathered

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.

because she needs money