When we rest immediately after completing an intense workout, our muscles will soon switch from:

a. aerobic respiration to lactic acid fermentation
b. lactic acid fermentation to aerobic respiration
c. aerobic respiration to alcoholic fermentation
d. alcoholic fermentation to aerobic respiration

I believe the answer is actually B.lactic acid fermentation to aerobic respiration!!!

This is because after we rest, the lactate acid is carried to liver where cellular respiration helps change it back to pyruvate

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.