The structural formula of $H_2O_2$ is:

• A
  The structure is planar with $H-O-O$ bond angles of $101.5^{\circ}$.
• B
  $H-O-O-H$ (linear structure)
• C
  The structure is planar with $H-O-O$ bond angles of $101.5^{\circ}$ and all four atoms in the same plane.
• D
  The structure is non-planar where the $H-O-O$ bond angle is $97^{\circ}$ and the dihedral angle between the two $H-O-O$ planes is $101^{\circ}$.