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When a substance A reacts with water, it produces a combustible gas \( B \) and a solution of substance C in water. When another substance D reacts with this solution of \( C \), it produces the same gas \( B \) on warming but \( D \) can produce gas \( B \) on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. \( A, B, C \) and \( D \) respectively are:
(A) \( \mathrm{Na}, \mathrm{H}_{2}, \mathrm{NaOH}, \mathrm{Zn} \)
(B) \( \mathrm{K}, \mathrm{H}_{2}, \mathrm{KOH}, \mathrm{Al} \)
(C) \( \mathrm{Ca}, \mathrm{H}_{2}, \mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{Sn} \)
(D) \( \mathrm{CaC}_{2}, \mathrm{C}_{2} \mathrm{H}_{2}, \mathrm{Ca}(\mathrm{OH})_{2}, \mathrm{Fe} \)
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