A woman's prepregnant weight is determined to be average for her height. What will the nurse advise the woman regarding recommended weight gain during pregnancy?

Choice A rationale A weight gain of 28 to 40 pounds is recommended for women classified as underweight (Body Mass Index [BMI] < 18.5) prior to pregnancy. This higher range is necessary to support optimal fetal growth and replenish maternal nutrient stores, which are often depleted in underweight individuals. For a woman of average prepregnant weight, this range would be excessive. Choice B rationale A weight gain of 15 to 25 pounds is recommended for women classified as overweight (BMI 25.0-29.9) prior to pregnancy. A lower weight gain target helps minimize maternal and fetal complications associated with excessive weight gain, such as gestational hypertension or macrosomia, by managing energy balance. This range is too restrictive for an average-weight woman. Choice C rationale A weight gain of 10 to 20 pounds is recommended for women classified as obese (BMI&ge; 30.0) prior to pregnancy. This minimum weight gain supports minimal fetal needs while strictly managing maternal metabolic demands and risks. This range is considered inadequate for a woman who started at an average, healthy weight for her height. Choice D rationale A total weight gain of 25 to 35 pounds is recommended for women who begin pregnancy at a normal weight (BMI 18.5-24.9). This range ensures adequate nutritional reserves and energy for fetal growth, placental development, amniotic fluid, and increased maternal blood volume, supporting a healthy pregnancy outcome without excessive weight-related complications.