17. The most economical sources of hydrogen are the reactions of carbon, methane or carbon monoxide with water at high temperature. Which of the following reactions is called shift reaction?
(A) CH4(g) + H2O(g) → CO(g) + 3H2(g)
(B) C(s) + H2O(g) → CO(g) + H2(g)
(C) CO(g) + H2O(g) → CO2(g) + H2(g)
(D) CH3CH3(g) → CH2=CH2(g) + H2(g)
(E) H2O(g) → H2(g) + 1/2O2(g)

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