Jim has found that he must consume 2,300 calories a day to reach his health goals, but he doesn't want to give up his afternoon snack of pretzels. Unfortunately, he tends to eat the entire bag - which amounts to 1,300 calories.

Which of the following diets is lacking in nutrients that will help hair, skin, and nails to grow

a) A diet that is rich in vegetables but lacking carbohydrates
b) A diet that is rich in carbohydrates but lacking fruit
c) A diet that is rich in fruit but lacking protein
d) A diet that is rich in protein but lacking vegetables