Which of the following chemical equations for the formation of acid rain components and their action are correct and balanced?

1. A$2\mathrm{NO}{}_2+\mathrm{H}{}_2\mathrm{O}\to 2\mathrm{HNO}{}_3$
2. B$2\mathrm{SO}{}_2+\mathrm{O}{}_2\to 2\mathrm{SO}{}_3$
3. C$\mathrm{SO}{}_3+\mathrm{H}{}_2\mathrm{O}\to \mathrm{H}{}_2\mathrm{SO}{}_4$
4. D$\mathrm{CaCO}{}_3+\mathrm{H}{}_2\mathrm{SO}{}_4\to \mathrm{CaSO}{}_4+\mathrm{H}{}_2\mathrm{O}+\mathrm{CO}{}_2$