What is VO2max?
Answer: First you have to understand that it stands for maximal oxygen uptake and is the amount of oxygen that your body is capable of using in one minute. If you are an athlete it is measure in order to tell you your capacity and your potential endurance. Therefore the answer is B) the highest level of oxygen consumption that can be sustained during exercise.
I hope it helps, Regards.
The answer is B, afferent carries the stimuli