Hexamine is a crystalline solid that serves as a fuel for portable stoves. The diagram below illustrates its skeletal structure. What empirical formula is shown by 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$\text{C}_6\text{H}_{12}\text{N}_4$