It is an example of a idiom.
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Answer:
A, Join in the Fun Run to help a good cause, make friends, and get healthy.
Explanation:
<em>B causes people to have the "if only 75% need to join, why does that mean me?" mindset.</em>
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<em>C causes people to have the "why does that matter it's not me?" mindset.</em>
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<em>D is not a compelling argument to make to a student.</em>
