Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ The binding energy per nucleon is practically independent of the atomic number for nuclei of mass number in the range $30$ to $170$.
Reason $R:$ Nuclear force is short-ranged.
In the light of the above statements, choose the correct answer from the options given below:

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

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