Answer
Please see the work below.
Work Step by Step
We know that $SO_2$ and $C_2H_2$ are liquefied at $25C^{\circ}$. If we want to liquefy $CH_4$ we should lower its temperature below $-82^{\circ}$ and then compress it. We will lower temperature below $-140C^{\circ}$ and then compress it.
