Which of the following is optically active molecule ?

• A

  \[\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,{C_2}H_5\,\,}\\
  |\\
  {C{H_3} - C - Me}\\
  |\\
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2} - OH}
  \end{array}\]

• B

  \[\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,{C_2}H_5\,\,}\\
  |\\
  {C{H_3} - C - Cl}\\
  |\\
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2} - C{H_3}}
  \end{array}\]

• C

  \[\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}\,\,\,\,\,\,}\\
  |\\
  {H - C - Cl}\\
  {\,\,\,|\,\,\,}\\
  {\,\,\,\,\,\,\,OH\,\,\,}
  \end{array}\]

• D

  All of these