B problem solver this is correct answer in my opinion
The answer is either he is using his large muscles or his body heats up but I am not sure which one sorry hope I helped a little
Answer:
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<span>Reaction time is the time from the start of the stimulus to to the beginning of movement in reaction to the stimulus. Since she has high cardiorespiratory endurance there is a greater coordination in the working of her heart, muscles and lungs. This will help her to get a good reaction time and will increase her performance level.</span>