3. When breast milk and formulas are the only source of nutrients, fats and lipids provide what percentage of energy consumed by an infant? A. 50 percent B. 60 percent C. 70 percent D. 80 percent A B D

The correct answer is C. 70 percent.<br /><br />When breast milk and formulas are the only source of nutrients for an infant, fats and lipids provide approximately 70 percent of the energy consumed by the infant. Fats and lipids are essential for the growth and development of the infant's brain and overall health. Breast milk and formulas are specifically designed to provide the necessary nutrients, including fats and lipids, to support the infant's rapid growth and development during the early stages of life.