Proteins are important for all of the following reasons except: a
Storing fat
b
Digestion
c
Immune system function
d
Hair and nail growth

I would say it's C. Protein helps with storing fat, helps with digestion (it helps break down certain enzymes) and hair/nail growth

What you should re write your question it doesn’t make sense

1. b vitamins2. vitamin k3. vitamin d4. examples are walnuts, seeds, tofu5.  total fat, saturated fat, trans fat, cholesterol, sodium, total carbohydrate, dietary fiber, sugars, protein, vitamin a, vitamin c, calcium, and iron.6. 11257. they have to contain reliable information8. less than 10%  9. i didnt read the course so im not surehope that : p