Answer:
D. Upset Stomach
Explanation:
Susan studied late into the night to get into her dream college. Since she slept too late, her body did not rest properly, which probably had an uncomfortable effect on Susan's body. Since Susan did not sleep for the amount of hours needed for her body to rest, we can say that Susan was always tired and sleeping beyond normal. This caused a drop in energy in Susan's body and also generated, increased heart rate, stomach pain, among other harmful effects.