Alex is a 22-year-old professional soccer player who trains several hours a day, seven days a week. To ensure she is meeting her nutritional needs during this time in her life, she should
a. completely eliminate sugar from her diet to give her more energy for playing soccer
b. lower her daily calorie intake so she develops more lean muscle for playing soccer
c. make sure her calorie intake is higher than average because of the extra energy she is using for soccer
d. only drink water during training and game time to make sure she is staying hydrated