Answer:
Hello now,
The human body system that would be most affected in this scenario would be B, the Respiratory and circulatory system.
Lactic acid is the result of fermentation. Fermentation is when there is a lack of oxygen but youre body is still trying to get you enough ATP molecules (energy) to function. It is the stuff that makes you sore lol
D, contains fluid that becomes more concentrated as it moves down into the medulla
