Question

what are the two primary causes of acid rain?
a fossil fuel combustion and fertilizer
b vehicle exhaust and fertilizer
c vehicle exhaust and algae blooms
d fossil fuel combustion and vehicle exhaust

Explanation:

Acid rain is mainly caused by emissions of sulfur dioxide ($\text{SO}_2$) and nitrogen oxides ($\text{NO}_x$). Fossil fuel combustion (e.g., in power plants) releases large amounts of $\text{SO}_2$ and $\text{NO}_x$. Vehicle exhaust also emits significant $\text{NO}_x$. Fertilizer mainly relates to issues like water pollution (e.g., eutrophication) rather than acid rain. Algae blooms are typically a result of nutrient - rich (e.g., from fertilizers) water bodies and not a primary cause of acid rain.

Answer:

D. fossil fuel combustion and vehicle exhaust