The correct answer would be, Swimming.
An active student injured his knee playing basketball and has been advised by his doctor to avoid impact activities that cause heavy force on his bones. Swimming would be the most effective activity he can do to maintain his stamina without further injury.
Explanation:
An active student in sports had an injury, which caused him not to play or engage in activities that would have impact on his bones and cause further injury to his knee.
Because he is an active player, and he does not want to loose his stamina until he gets well, he should continue doing some activity which would maintain his stamina without causing further injury to his knee. So in this scenario, swimming is the best option. This will maintain his stamina and will also help in relaxing the body.
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