Which Is Not an Example of Useful Advice You Could

Which is not an example of useful advice you could offer a parent about how to minimize sports injury in their children?

A) Have children switch off among different sports in different seasons.
B) Promote exercise to improve flexibility, balance, control, and strength of the core and trunk.
C) Suggest that children avoid organized sports entirely.
D) Ensure that children receive adequate rest.
E) None of the above is useful advice.