$A$ pair of compounds having the same boiling points are

• A
  $cis$-but-$2$-ene and $trans$-but-$2$-ene
• B
  $n$-hexane and neo-hexane
• C
  benzene and naphthalene
• D
  $(+)$ butan-$2$-ol and $(-)$ butan-$2$-ol