A compound, X, has a mass composition of $40.0\%$ carbon, $6.7\%$ hydrogen and $53.3\%$ oxygen. Its relative molecular mass, $M_r$, is $60$. What is the molecular formula of X?
- A$\text{CH}_2\text{O}$
- B$\text{CH}_4\text{O}$
- C$\text{C}_2\text{H}_4\text{O}$
- D$\text{C}_2\text{H}_4\text{O}_2$