Which of the following pairs of compounds is a pair of enantiomers?

• A
  $3$-bromo-$2$-chlorobutane (diastereomers)

  
• B
  $1,3$-dimethylcyclopentane (cis and trans isomers)

  
• C
  $1,2$-dimethylcyclohexane (cis and trans isomers)

  
• D
  $1,2,3$-trichlorobutane (diastereomers)