Correct Answer - B::C
`Be_2C +4H_2O rarr 2Be(OH)_2 underset("Methane") ( CH_4)`
`Al_4C_3 +12H_2O rarr 4A l(OH)_3 + underset ("Methance")`
`CaC_2+2H_2 O rarr Ca(OH)_2 + underset ("Acetaylenc")`
`Me_2gC_3 + 4H_2O rarr 2Mg(OH)_2 + underset ("Propne") (HC -= C-CH_3)`.