Given below are two statements : One is labelled as Assertion A and...

Given below are two statements : One is labelled as Assertion A and other is labelled as Reason $R$. Assertion $A:$ The dihedral angles in ${H}_{2}{O}_{2}$ in gaseous phase is $90 . 2 °$ and in solid phase is $111 . 5 °$. Reason $R:$ The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces. Choose the most appropriate answer from the options given below for $A$ and $R$.