$A$: The $O-O$ bond length in $H_2O_2$ is smaller than that in $O_2F_2$.
$R$: $H_2O_2$ is an ionic compound.

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