Which one of the following statements regarding daily protein intake is the most accurate?
A. Adults need about 10 grams of protein for every 20 pounds of body weight.
B. Adults need about 5 grams of protein for every 15 pounds of body weight.
C. Adults need about 4 grams of protein for every 10 pounds of body weight.
D. Adults need about 2 grams of protein for every 5 pounds of body weight.