Which one of the following reactions represents water `-` gas shift reaction `?`
A. `CO(g)+H_(2)O(g)underset("iron chormate")overset(673K)rarrCO_(2)+H_(2)`
B. `C(s)+H_(2)O(g)overset(1270K)rarrCO(g)+H_(2)`
C. `CH_(4)(g)+H_(2)O(g)underset(Ni)overset(1270K)rarrCO(g)+3H_(2)(g)`
D. None of these
