Hexamine is a crystalline solid that serves as a fuel in portable stoves. The diagram illustrates its skeletal structure. State the empirical formula of hexamine.
- A$\text{CH}_2\text{N}$
- B$\text{C}_3\text{H}_6\text{N}_2$
- C$\text{C}_4\text{H}_8\text{N}_4$
- D$\text{C}_6\text{H}_{12}\text{N}_4$