An intake of 3 to 12 grams of per kilogram (kg) of body weight per day is recommended for athletes.
a. fat
b. carbohydrate
c. protein
d. fluid

Carbohydrates

Explanation:

The carbohydrates is taken by the body ranging from 3 grams to 12 grams depending on the body composition.

It is soul source of energy must be taken in more amount as compared to other nutrients.

Carbohydrates in the body improves the performance of muscles by delaying the fatigue and allows the athlete to compete at higher levels.

So, the intake of carbohydrates is more in case of athlete.

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .