Which of the following is a benefit to getting an adequate amount of sleep?
a. better concentration
b. improved physical health
c. improved chances of success
d. all of the above

D.) All of the above.

When you get adequate amount of sleep you will improve your physical health, will have better concentration, and will have better chances of success.

Adequate amount of sleep is required because this is the time when your energy is replenished, when cells build or repair themselves to function at their normal level. 

The answer would be fracture.