Yes a quote made by the president needs to be cited.
You will need to quote the example. We don't have your textbooks to refer to. :-)
Common knowledge information does not need to be cited.
Biofuel is fuel that is made from organic materials. The largest consumer is the United States Army. When used in a paper, they must be cited the same way articles or journals are cited.
Properly cited, I can't imagine they would take issue with a few lines appearing. The monument manufacturer most likely has experience with this issue.
I,II, and III
Facts and common knowledge that are widely known and accepted do not typically need to be cited. However, if the information is not widely known or if it is critical to your argument, it is best practice to cite the source to provide credibility and avoid plagiarism.
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Common knowledge, widely accepted facts, and information that is considered general knowledge in the field do not need to be cited in academic writing.
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Parenthetical citations tell the readers where the information was found. They give the readers an entry into the works cited page. The works cited page includes all the referenced sources that were cited.
If you're using a quote that contains a quote you'll need to surround the embedded quote with single quotation marks.
Yup.