Select the correct answer. What is the difference between heat exhaustion and heat stroke? A. Heat exhaustion is a decrease in blood volume, while heat stroke is an increase in blood volume. B. Heat exhaustion is an increase in blood volume, while heat stroke is a decrease in blood volume. C. Heat exhaustion involves extreme sweating, while heat stroke involves a lack of sweating. D. Heat exhaustion involves a lack of sweating, while heat stroke involves extreme sweating.