An industrial method of preparation of methanol is:

The catalytic reduction of carbon monoxide is a step in the industrial process of making methanol. Water gas is employed for this purpose.
An equimolar combination of $\mathrm{CO}$ and ${\mathrm{H}}_2$ is called water gas.
Methanol $\left({\mathrm{CH}}_3\mathrm{OH}\right)$ is made from water gas that has been converted by a mixture of zinc oxide and chromium oxide $\left(\mathrm{ZnO}-{\mathrm{Cr}}_2{\mathrm{O}}_3\right)$. The reaction is occurring at 573 K.

$\mathrm{CO}+2{\mathrm{H}}_2\stackrel{{\mathrm{ZnO}}_2{\mathrm{Cr}}_2{\mathrm{O}}_3}{\to }{\mathrm{CH}}_3\mathrm{OH}$

The best choice is A.