Dose anyone know this?

aerobic capacity is directly related to
flexibility
heart strength
bone strength
muscle endurance

Aerobic means with the use of oxygen, such as running. Anaerobic means without the use of oxygen, such as lifting heavy weights quickly.
Aerobic exercise will increase heart strength, and muscle endurance, but not bone strength.
To increase bone strength consume youre daily recommended value of calcium and vitamin D. Calcium cannot be absorbed by the body without vitamin D, people tend to forget that. 

I think the correct answer from the choices listed above is the last option. Aerobic capacity is directly related to muscle endurance.  Anaerobic exerciserelies on energy sources that are stored in the muscles and, unlike aerobic exercise, is not dependent on oxygen from (breathing) the air.