An inorganic metal oxide $(A)$ heated with carbon gives compound $(B)$,which on reaction with water gives ethyne. What are the compounds $(A)$ and $(B)$?
- A$A = CaO, B = CaC_2$
- B$A = CaC_2, B = CaO$
- C$A = CO, B = CaO$
- D$A = CO_2, B = CaO$
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