Atomic masses: Na 23, Ca 40, S 32, C 12, O 16, H 1. Which of the following statements about the percentage of initial mass lost on complete conversion are correct?

1. A$\mathrm{CaCO}{}_3$ to $\mathrm{CaO}$ loses 44.0%.
2. B$\mathrm{CaSO}{}_4\cdot 2\mathrm{H}{}_2\mathrm{O}$ to plaster of Paris, $(\mathrm{CaSO}{}_4){}_2\cdot \mathrm{H}{}_2\mathrm{O}$, loses 15.7%.
3. C$\mathrm{NaHCO}{}_3$ to $\mathrm{Na}{}_2\mathrm{CO}{}_3$ loses 36.9%.
4. D$\mathrm{Na}{}_2\mathrm{CO}{}_3\cdot 10\mathrm{H}{}_2\mathrm{O}$ to anhydrous $\mathrm{Na}{}_2\mathrm{CO}{}_3$ loses 50.0%.