For which purpose and audience would an email be the most effective type of document?

a. applying for a job at the shoe store at the mall
b. convincing your parents to let you borrow the car
c. inquiring about volunteer opportunities for a local political candidate
d. persuading the senior class to elect you prom queen

C.Inquiring about volunteer opportunities for a local political candidate

Explanation:

This is the best choice because there may be many different positions available as a volunteer for a local political candidate. Also, an application to be a volunteer and other information can be easily sent through email. Other options are not good choices. A job application should not be emailed because it is too informal. Convincing your parents to let you borrow the car should be a face to face conversation. Persuading the senior class to elect you prom queen is usually done in a speech and with other campaign advertising.

go to the faq page, you'll find the instructions there.

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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.