Breathing hard during exercise brings oxygen to your muscles, which the process release energy to fuel your workout
a) oxidation
b) active transport
c) diffusion

A) oxidation

Explanation:

Breathing is a vital metabolic process which avails oxygen to the body. During the process of exercise the muscles and other important cellular structures requires oxygen our heart pumps the blood faster so as to avail oxygen to all the parts of the body which requires oxygen. It also results in the oxidation of the food molecules which when breaks down result in the release of energy in the form of ATP. The energy in the form of ATP is used by the muscles which helps in workout.  

the awnser is d i think

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