The Gateway Arch- Common Noun
St. Louis, Missouri- Proper Noun
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C) verbs and adverb phrases
I believe the answer is D. This is because the ":" symbol is used to list what the previous phrase was describing.
Answer: The website address.
In a citation for an essay, this is the section where the website address should be located. The title of the speech and the name of the website have already been included. Citing your sources properly is one of the most important skills when writing an academic essay. Citations make it easier for people to check your primary sources, whether to corroborate your claims, or to learn more about a topic. It also makes your paper more credible.