What is a central idea that the author develops throughout the dark game?

The central theme about the Dark Game was dangerous it was to be a spy.  Elizabeth took many risks in gathering and sending information to the Union lines.  She also took care to help Union escapees get back to their troops.  It was dangerous but she firmly believed in preserving the Union and took the risk to all of this.

the answer is a, c, d, e

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.