D. leave it out.
Information that does not go with the main idea of the essay distract the reader and take away from the essay's purpose. Depending on the information, it may also reduce your credibility on the essay's topic. An unreliable or untrustworthy essay can negate even the best reasons and thoughtful thinking. Leaving it out reduces the risk of the essay being considered incorrect. Also, including unnecessary information, like jokes, can change the tone of your essay.