${\mathrm{C}}_2{\mathrm{H}}_6\underset{\mathrm{uv}}{\overset{{\mathrm{Cl}}_2}{\to }}\mathrm{X}\stackrel{\mathrm{wurtz}\mathrm{reaction}}{\to }\mathrm{Y}.$ What is Y

• A

  ${\mathrm{C}}_3{\mathrm{H}}_8$

• B

  ${\mathrm{C}}_4{\mathrm{H}}_{10}$

• C

  ${\mathrm{CH}}_4$

• D

  ${\mathrm{C}}_5{\mathrm{H}}_{12}$