Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : $Image-I$ can be easily reduced using $Zn-Hg / HCl$ to $Image-II$.
Reason $R : Zn-Hg / HCl$ is used to reduce carbonyl group to $-CH_2-$ group.
In the light of the above statements,choose the correct answer from the options given below:

• A
  $A$ is false but $R$ is true
• B
  $A$ is true but $R$ is false
• C
  Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$
• D
  Both $A$ and $R$ are true and $R$ is the correct explanation of $A$