Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A:$ The dihedral angle in $H_{2}O_{2}$ in the gaseous phase is $90.2^{\circ}$ and in the solid phase is $111.5^{\circ}$.
Reason $R:$ The change in dihedral angle in the solid and gaseous phases is due to the difference in the intermolecular forces.
Choose the most appropriate answer from the options given below for $A$ and $R$.

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