The relative molecular mass, $M_r$, of liquid Z is 60. Z is made up of 40.0% carbon, 6.70% hydrogen and 53.3% oxygen. Which row gives the correct empirical formula and molecular formula of Z?
- AEmpirical: $\text{CH}_2\text{O}$, Molecular: $\text{CH}_2\text{O}$
- BEmpirical: $\text{CH}_2\text{O}$, Molecular: $\text{C}_2\text{H}_4\text{O}_2$
- CEmpirical: $\text{C}_2\text{H}_4\text{O}_2$, Molecular: $\text{C}_2\text{H}_4\text{O}_2$
- DEmpirical: $\text{CH}_3\text{O}$, Molecular: $\text{C}_2\text{H}_6\text{O}_2$