Final answer:
Smoking during pregnancy is harmful, leading to hindered growth and development of the unborn baby, which could result in low birth weight and various health complications, including SIDS and preterm labor.
Step-by-step explanation:
When expecting mothers smoke, it exposes the unborn baby to a range of harmful effects. The correct answer to the impact of tobacco on an unborn baby is d) Hindered growth and development, potentially leading to low birth weight and health complications. Tobacco smoke contains chemicals that are harmful, including carbon monoxide and cyanide, which can reduce the oxygen supply to the baby, leading to issues such as growth reta_rdation, increased risk for preterm labor, and placental problems. Additionally, smoking during pregnancy is associated with a higher risk of stillbirth, sudden infant death syndrome (SIDS), and it may complicate pregnancy.