Given below are two statements: One labelled as Assertion $A$ and the other labelled as Reason $R$:
Assertion $A$: The first stage of gametophyte in the life cycle of moss is protonema stage.
Reason $R$: Protonema develops directly from spores produced in capsule.
In the light of the above statements,choose the most appropriate answer from options given below:

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