Consider the 1,2-Dichloro Derivative of Ethylene in Which One of the Hydrogen

Consider the 1,2-dichloro derivative of ethylene in which one of the hydrogen atoms on each of the carbon atoms in ethylene is substituted with a chlorine atom, giving the structural formula CHClCHCl. Which of the following is true?

A) The cis isomer is more polar.
B) The trans isomer is more polar.
C) Neither cis nor trans isomers are polar.
D) Both cis and trans isomers are equally polar.
E) There are no isomers for this molecule.