In an attempt to maximize the yield of methanol (amount of methanol produced), a chemist would try to shift ..

The answer might depend on the equation of the reaction involved, which you didn't show. It might also depend upon whether the reaction is endothermic or exothermic. Basically, you need to look at the equation and think about applying LeChatlier's Principle to the possible answers, and see which will increase the yield of methanol. One of your answers is pretty obviously the correct one when you think about it.