The equation that represents the water gas shift reaction is :

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A. `CH_(4) (g) + H_(2) O(g) overset(1270 K) underset("Ni") (to) CO (g) + 3 H_(2) (g)`
B. `2 C (s) + O_(2) (g) + 4 N_(2) (g) overset(1273K)(to) 2 CO (g) + 4 N_(2) (g)`
C. `C(s) + H_(2) O(g) overset(1270 K)(to) CO (g) + H_(2) (g)`
D. `CO (g) + H_(2) O(g) overset(673 K) underset("Catalyst") (to) CO_(2) (g) + H_(2) (g)`