Identify $X, Y$ and $Z$ in the following reaction sequence:
$C_6H_5CH_2CH_2OH$ $\xrightarrow{X} C_6H_5CH_2COOH$ $\xrightarrow{Y} Z$

• A
  $X=$ $PCC$,$Y=$ $NaOH, CaO$,$Z=C_6H_5CH_3$
• B
  $X=$ $PCC$,$Y=$ $LAH$,$Z=C_6H_5CH_2CH_3$
• C
  $X=$ Jones reagent,$Y=$ $NaOH, CaO$,$Z=C_6H_5CH_2CH_3$
• D
  $X=$ Jones reagent,$Y=$ $NaOH, CaO, \Delta$,$Z=C_6H_5CH_3$