In which pair does the second substance have a boiling point lower than the first substance?
- A$\text{C}_2\text{H}_6$ and $\text{C}_2\text{H}_5\text{Cl}$
- B$\text{CH}_3\text{OCH}_3$ and $\text{C}_2\text{H}_5\text{OH}$
- C$\text{Ne}$ and $\text{Ar}$
- D$\text{CH}_3\text{NH}_2$ and $\text{C}_2\text{H}_6$