Which BEST represents the function of a supporting sentence? A. It adds new ideas to the topic sentence.
B. It adds more details to the topic sentence.
C. It is not longer than the topic sentence.
D. It repeats the topic sentence.

B.

Explanation:

A supporting sentence's purpose is to support the thesis by adding details to the topic.

he gives his freedom of speach

explanation:

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.