$X$ melts at a low temperature and is a bad conductor of electricity in both liquid and solid states. $X$ is:

• A
  $Carbon$ $tetrachloride$ $(CCl_4)$
• B
  $Mercury$ $(Hg)$
• C
  $Silicon$ $carbide$ $(SiC)$
• D
  $Zinc$ $sulphide$ $(ZnS)$