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Which compound has the highest value of $pK_a$ ?

• A
  $Cl - CH_2 - CH_2 - COOH$
• ✓
  $CH_3 - CH_2 -COOH$
• C
  $\begin{array}{*{20}{c}}
    {C{H_3} - CH - COOH} \\ 
    {|\,\,\,\,\,\,\,\,\,\,\,} \\ 
    {Cl\,\,\,\,\,\,\,\,\,} 
  \end{array}$
• D
  $\begin{array}{*{20}{c}}
    {Cl\,\,\,} \\ 
    {|\,\,\,\,\,} \\ 
    {C{H_3} - C - COOH} \\ 
    {|\,\,\,\,\,\,} \\ 
    {Cl\,\,\,\,\,} 
  \end{array}$