(1) Erik finds that football tryouts are in two weeks and he wants to play. (2) Erik's parents say he can try out if he earns an A or B on his next two math tests. (3) Erik loves math, so studying for the tests will not be a problem. (4) Erik is determined to do well to get good grades, so he devotes two hours every night to studying math.

Sentence 3 says Erik loves math, so studying will not be a problem, but it does not support the main idea that he is working hard to earn the grades needed to try out. Sentence 4 gives the relevant supporting detail: he studies math for two hours every night to do well on his tests. Therefore, sentence 3 is the least relevant.

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