If you had no knowledge of the subject then According to the American Academy of Pediatrics (AAP), children and infants are among the most susceptible to many air pollutants- this claim should be the most credible.
Option: 2
Explanation:
If a person do not have any knowledge about environment related matter but have to believe some stement only by some common sense then the given context that according to the American Academy of Pediatrics children and infants are among the most susceptible to many air pollution.
It is because children and infants have much less immunity power in comparison with adults. They are more prone to attack by diseases. Polluted air consists of harmful gases which affect child's health. As it is a report of doctor's organization that's why its reliable more.
By having total power or taking power by force
Salutations!
At what age do most boys start growing facial hair?
Facial hair doesn't tend to appear at a specific age. It depends on each and every individual. Some might go through that phase in a pretty early stage.
Hope I helped :D