What are the boxed words? (Mechanics, plumbers) and other (repair persons) make good wages,

A Compound subject

B. Compound verb

A.

Explanation:

I think it's A. I could be 100% wrong. I hope you pass. :)

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.

not sure maybe the subject closer to it or subject-verb agreement