Which of the following reactions increases production of dihydrogen from synthesis gas?

• A

  CH_4(g) + H₂O_(g) $\underset{\mathrm{Ni}}{\overset{1270\mathrm{K}}{\to }}$CO_(g) + 3H_2(g)

• B

  CH_(g) + H₂O_(g) $\stackrel{1270K}{\to }$CO_(g) + H_2(g)

• C

  CO_(g) + H₂O_(g) $\underset{\mathrm{Catalyst}}{\overset{673\mathrm{K}}{\to }}$CO_2(g) + H_2(g)

• D

  C₂H_6(g) + 2H₂O_(g) $\underset{\mathrm{Ni}}{\overset{1270\mathrm{k}}{\to }}$2CO_(g) + 5H_2(g)