Design a brief, evidence-based intervention bundle for a sedentary overweight pregnant person in early second trimester to reduce risk of gestational diabetes and hypertensive disorders. Which combination is most appropriate?

• A. Immediate prescription of vigorous high-impact exercise that doubles baseline activity without dietary changes to rapidly reduce maternal weight during pregnancy before any nutrient counseling.
• B. Complete carbohydrate elimination and a zero-sodium diet along with bed rest to minimize blood pressure and glucose levels, without clinical monitoring or professional oversight.
• C. Weekly intravenous nutrient infusions combined with sporadic intense exercise sessions and no daily meal planning, relying solely on supplements to prevent metabolic disease.
• D. Moderate-intensity aerobic activity 30 minutes most days of the week, individualized caloric guidance to achieve moderate gestational weight gain consistent with BMI, and increased intake of high-fiber foods with controlled carbohydrate distribution at meals to reduce postprandial glucose spikes.

Answer: (D)