Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A:$ An electric fan continues to rotate for some time after the current is switched off.
Reason $R:$ The fan continues to rotate due to inertia of motion.
In the light of the above statements,choose the most appropriate answer from the options given below.

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