Answer: hexane, a nonpolar solvent
Step-by-step explanation:
A Nonpolar gas is one that is NOT ionic; i.e it does not dissociate into IONS when dissolved in water.
Methane CH4, is an organic, nonpolar gas. Thus, it will MOST EFFECTIVELY dissolve in a Nonpolar solvent like HEXANE.
so, HEXANE, a nonpolar solvent is the right answer