Which gas is liberated when ${\text{Al}}_{\text{4}}{\text{C}}_{\text{3}}$ is hydrolysed  

• A

  ${\text{C}}_{\text{2}}{\text{H}}_{\text{2}}$

• B

  ${\text{CH}}_{\text{4}}$

• C

  ${\text{C}}_{\text{2}}{\text{H}}_{\text{6}}$

• D

  ${\text{CO}}_{\text{2}}$