Vitamins and minerals are examples
micronutrients
macronutrients
enzymes
carbohydrates

The answer is Micronutrients.

Explanation: I took the test (～￣▽￣)～

Also here is a snip

answer; /// i believe that the correct answer is (d); /// alternate walking and running;

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise