To evaluate the effectiveness of an argument, the reader needs to assess whether the author's reasons and evidence are
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Relevant is the correct answer.

Explanation:

According to the Cambridge Dictionary, the word relevant means "connected with something what is happening or being discussed." So, if the reader wants to evaluate how effective an argument is, it is necessary to consider the relevance of the reasons and evidence provided by the author.

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the students want to see the great sphinx of giza, which is very popular with tourists.