Exercise is beneficial . . . . . . . . health. A. to B. with C. on D. at

The correct answer is: Exercise is beneficial for health.

The other options are incorrect because they do not make sense in the context of the sentence.

• To is used to indicate a purpose or goal. For example, “I go to the gym to exercise.”
• With is used to indicate that something is used in conjunction with something else. For
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  example, “I exercise with weights.”
• On is used to indicate a location or position. For example, “I exercise on the treadmill.”
• At is used to indicate a time or place. For example, “I exercise at the gym on Mondays and Wednesdays.”

In the sentence “Exercise is beneficial for health,” the word “for” indicates that exercise is good for or beneficial to health. This is the most logical and common way to use the word “for.”