Which of the following lists contains only components that contribute to gestational weight gain (select the best option)?

• A. Fetus, maternal fat stores, placenta, increased blood volume, enlarged uterus, amniotic fluid
• B. Only fetus and placenta, because maternal tissues do not change appreciably during pregnancy
• C. Loss of maternal bone mass and decreased body water, which together explain most weight changes
• D. Increased muscle mass and decreased adipose tissue as the mother adapts energetically

Answer: (A)