• A

  $\mathrm{RCH}_{2} \mathrm{CH}_{2} \mathrm{OH}$
• B

  $\mathrm{RCHO}$
• C

  RCOR
• Correct answer
  D

  $\mathrm{RCH}_{2} \mathrm{OH}$

Solution

In this reaction $\mathrm{LiAlH}_{4}$ acts as reducing agent.

Hence, the correct answer is option: 'D'.