For adult human females, the metabolic "costs" of pregnancy and lactation are

A) 100-125% more than when she was nonpregnant.
B) 30-40% more than when she was nonpregnant.
C) 5-8% more than when she was nonpregnant.
D) 10-20% less than when she was nonpregnant.
E) 30-40% less than when she was nonpregnant.