Formation of polythene from calcium carbide takes place as \[\] $ CaC_2+2H_2O \rightarrow Ca(OH)_2+C_2H_2$ \[\] $ C_2H_2+H_2 \rightarrow C_2H_4$ \[\] $ nC_2H_4 \rightarrow (- CH_2 - CH_2 -)n$ \[\] The amount of polythene obtained from 64.1 kg of $CaC_2$ is

Question

$\begin {array} {1 1} (a)\;7 \: Kg & \quad (b)\;14 \: Kg \\ (c)\;21 \: Kg & \quad (d)\;28 \: Kg \end {array}$