What is the function of carbohydrates in an athlete's diet?

Carbohydrates are the most easily available source of energy found in food.
Carbohydrates are not necessary for maintaining glycogen stores in muscles.
Athletes do not need to consume complex carbohydrates for optimal performance.
Sweet foods like candy and pastries are a good source of carbohydrates for athletes.
a) Only statement 1 is correct.
b) Statements 1 and 4 are correct.
c) Statements 2 and 3 are correct.
d) Only statement 1 and 3 are correct.