40. What are X, Y, and Z in the following reactions?

The reactions are not balanced.
(A) X = Ca, Y = CO₂, Z = H₂
(B) X = Ca, Y = CO, Z = H₂
(C) X = CaC, Y = CO₂, Z = CH₄
(D) X = CaC₂, Y = CO, Z = C₂H₂
(E) X = CaC₂, Y = CO, Z = CH₄

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