Which of the following reactions is an example of use of water gas in the synthesis of other compounds?

${\mathrm{CH}}_4\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\underset{\mathrm{Ni}}{\overset{1270\mathrm{K}}{\to }}\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

$\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\underset{\mathrm{catalyst}}{\overset{673\text{ K}}{\to }}{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}+{\mathrm{nH}}_2\mathrm{O}\left(\mathrm{g}\right)\underset{\mathrm{Ni}}{\overset{1270\mathrm{K}}{\to }}\mathrm{nCO}+\left(2\mathrm{n}+1\right){\mathrm{H}}_2$

$\mathrm{CO}\left(\mathrm{g}\right)+2{\mathrm{H}}_2\left(\mathrm{g}\right)\underset{\mathrm{Catalyst}}{\overset{\mathrm{Cobalt}}{\to }}{\mathrm{CH}}_3\mathrm{OH}\left(\mathrm{l}\right)$