Answer:
An effective argumentative essay must contain a claim that is supported by the in text citations.
Explanation:
This is so that your essay won't be opinionated. When your essay is opinionated, people (in general) will be less likely to believe your claim. But when you cite multiple sources, your reader will get different views on the subject and therefore will be more likely to agree to your side/claim.
tip: When you have a source citation opposite of your claim, try to find a way to refute it
Hope I answered your question ^_^
