Question

The diagram below shows the structural formula and 3D model of the same substance. Which substance is represented by the diagram above?

Answer 1

H2O
OH
H2O2
OH2

Answer 2

It helps use help you if you post the image!

If there are 2 or four atoms in the molecule, there is only one answer.
I have never seen H2O written as OH2, wonder if they represent the same thing.
If there are two hydrogen atoms on each side of the oxygen atom at about 105 degrees, it's water, H2O.
See more here:
for water: https://en.wikipedia.org/wiki/Hydrogen_peroxide
for Hydrogen peroxide: https://en.wikipedia.org/wiki/Hydrogen_peroxide

Note:
Next time please post in chemistry, and post here for help referring to the chemistry post. Otherwise the real helpers in chemistry won't see your post.