Which of the following is a complex sentence? As...
A. Although she was sick today, she still went to work.
B. Don't touch the hot stove!
C. I can't believe it is already Friday!
D. The team was very happy they finally won.

A

Explanation:

A complex sentence has an independent clause & a dependent clause which are usually seperated by a comma.

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.