Respuesta :
Its A because C and D arent a type of exercise and B means without air.
Answer:
A- Aerobic
Explanation:
Based on the information provided within the question it can be said that the best exercise that Mark's Doctor can suggest would be Aerobic exercise. These are exercises based on a set rhythm which increase strength as well as cardio-respiratory endurance. Meaning it will bring more oxygen to the body and increase stamina.