The use of ankle weights when running or walking

Ahelps to strengthen the ankles and knees.
Bisn't recommended because they can damage muscles and ligaments.
Cimproves the ability to jump.
Dhelps to improve cardiovascular endurance

Verified Answer :

I think the answer is D. Helps to improve cardiovascular endurance

Dhelps to improve cardiovascular endurance. hope this helps. 

wearing ankle weights between 1 or 3 pounds can elevate your heart rate by up to 5 beats per minute and also the rate at which you burn calories by up to 10 %