Assertion $(A)$: Aldehydes are more reactive than ketones towards nucleophilic addition reactions.
Reason $(R)$: In aldehydes,carbonyl carbon is less electrophilic compared to ketones.
The correct answer is

• A
  $(A)$ and $(R)$ are correct. $(R)$ is the correct explanation of $(A)$
• B
  $(A)$ and $(R)$ are correct,but $(R)$ is not the correct explanation of $(A)$
• C
  $(A)$ is correct but $(R)$ is not correct
• D
  $(A)$ is not correct but $(R)$ is correct