The aerobic exercise helps to increase: a. flexibility
b. cardiorespiratory
c. musculoskeletal fitness
d. the ability to perform moderate-to-high-intensity activity involving large muscle groups for long periods of time.

b) Cardio respiratory

Explanation:

Just as exercise strengthens other muscles in your body, it helps your heart muscle become more efficient and better able to pump blood throughout your body. This means that the heart pushes out more blood with each beat, allowing it to beat slower and keep your blood pressure under control. Aerobic exercise boosts your good cholesterol (HDL), and lowers your bad cholesterol (LDL).

Hope this helps ya! Best of luck <3

d would be your answer