To prevent an overuse injury from occurring, a person should a. vary his or her exercises from day to day and season to season. b. tie sneakers extra tightly to ensure a correct fit. c. wear protective gear, such as a knee brace. d. stay with the same exercises so that the same muscles become stronger.

To prevent an overuse injury from occurring, a person should vary his or her exercises from day to day and season to season. Tying your sneakers extra tight could potentially harm you. Protective gear is good to wear when exercising but it's not necessary. Doing the same exercises would cause an overuse injury to occur.

Your answer is: A) Vary his or her exercises from day to day and season to season 

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Her parents start noticing changes about her. she's probably just competive though not on drugs