Answer:
Tobacco. Smoking during pregnancy increases the risk of health problems for developing babies, including preterm birth, low birth weight, and birth defects of the mouth and lip. Nicotine is a health danger for pregnant women and developing babies and can damage a developing baby's brain and lungs. This could really harm the baby.
It is important for teens to eat well because they are growing and need energy and they need to stay healthy.
More information so that way we can know what your talking about?
Answer:
Both A and B, because if you have bad posture you will have weaker bones which can make you get hurt easier plus weaker bones will not be safe especially if you got in a car wreck.