The answer is B. Circular Reasoning.
Circular reasoning is when you attempt to argue by beginning with an assumption that what you are trying to prove is already true.
The author is thinking of adding one of these sentences. The sentence that contains a fallacy is Unless everyone in the U.S. including our grandparents can successfully use social media, we will be left behind.
<h3>What is a fallacy?</h3>
Fallacy is making or giving a wrong statement or move in constructing a false statement strongly true so that people believe it's true. Fallacy is used by politicians in the propaganda of their parties' promotion.
Thus, the correct option is B, We will fall behind if no one in the U.S., unless our grandparents, can use social media effectively.
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