That which must not be done in a concluding paragraph is this:
C. Introduce new ideas into the essay
The concluding paragraph of an essay is that part of the essay that contains the final thoughts and ideas. At this point in the essay, the author can decide to restate the thesis statement. He can also restate the thesis and make some effort in convincing the reader of the final thoughts.
That which should not never be done in the concluding paragraph of an essay is to introduce new ideas. The concluding portion contains the final thoughts and not new thoughts.
Going further, it is important to know that an essay typically has three parts which are the introduction, the body, and the conclusion. All of these have their functions and the kind of content that fit them.
For a text to make sense, none of these should be mixed up. New ideas should be introduced in the body of the essay and not its conclusion. So, option C is the answer.
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