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Which of the following is a true statement regarding marginal costs and benefits of studying?
Marginal benefits increase as students study for tests because their grades increase.
Marginal costs fall as students study for tests because their grades increase.
Marginal benefits of studying decrease because students have to give up progressively more valuable alternatives uses of their time.
Marginal costs of studying increase because incremental increases in grades decrease after a certain point.
Marginal costs of studying increase because students initially give up their least valuable alternative uses of time .