Final answer:
The best statement to include when teaching a pregnant adolescent about nutritional needs of pregnancy is option C: "Folic acid intake is the key to having a healthy baby."
Step-by-step explanation:
The best statement to include when teaching a pregnant adolescent about nutritional needs of pregnancy is option C: "Folic acid intake is the key to having a healthy baby." Folic acid is important for the proper development of the baby's brain and spinal cord. It can help prevent certain birth defects, such as spina bifida. Pregnant adolescents should aim to consume foods rich in folic acid, such as leafy greens, citrus fruits, and fortified cereals, or take a prenatal vitamin that contains folic acid.