Kaitlyn F. is a 21-year-old woman who weighs 121 pounds. She has taken up running in an effort to lose weight and improve her endurance. She runs 3 to 4 days a week for approximately 45 minutes to an hour. At the store, she finds a sports "energy gel" labeled as a "natural performance enhancer." Each 1.1-ounce package provides 100 kcalories, 40 milligrams sodium, 30 milligrams potassium, and 25 grams total carbohydrates. The directions read: "For best results, consume one package 15 minutes before activity, one to two packages per hour during activity and one package immediately after activity to aid in recovery. Always follow consumption with water." Kaitlyn is trying to determine whether she needs this product for her training regimen.

Based on information in your text, what main ingredient in this product would Kaitlyn expect to be a "natural performance enhancer"?

a. Glucose
b. Beta-alanine
c. Ribose
d. Creatine
e. Sodium bicarbonate