Major contributors to acid rain are :

$\text{ (P) }{\mathrm{CO}}_2$

$\text{ (Q) }{\mathrm{SO}}_2$

$\text{ (R) }{\mathrm{NO}}_2$

$\text{ (S) }{\mathrm{SO}}_3$

A Nitrogen oxides and sulfur oxides is the right answer.

When sulfur dioxide (${\mathrm{SO}}_2$) and nitrogen oxides (${\mathrm{NO}}_{\mathrm{X}}$) are released into the atmosphere, they are carried by wind and air currents, resulting in acid rain. Sulfuric and nitric acids are formed when ${\mathrm{SO}}_2$ and ${\mathrm{NO}}_{\mathrm{X}}$ combine with water, oxygen, and other molecules. These combine with water and other substances before dropping to the earth.

Therefore, option A is correct.