As acid rain is a mixture of pollutants and gasses. As rusting is a chemical reaction between oxygen and other gasses in the air alongside a material and a liquid. I would say they are both similar and that acid rain would speed the process of rusting/aid the process.
C
the chances of survival is the amount of offsprings the animal has therefore the answer is C.
A. Is not possible.
The pH scale runs from 0 to 14
Oxygen is the only element in that list, the rest are compounds.