Consider the hypothesis: Working at least 5 hours per day at a computer contributes to deterioration of eyesight. The alternative hypothesis is:       A. Working for less than 5 hours a day at a computer contributes to deterioration of eyesight.       B. Working at least 5 hours a day at a computer does not contribute to deterioration of eyesight.       C. Working at least 5 hours a day at a computer contributes to the deterioration of eyesight.       D. Working at least 5 hours a day at a computer improves eyesight.

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