# Galvanic cells/redox - confused regarding diagram

I'm not sure if I got this wrong because I interpreted the cell incorrectly. When they have an arrow pointing in to the tube for $\ce{O2}$, does this imply that $\ce{O2}$ is a reactant? If so then B is definitely wrong, which was my answer.

Is there any other reason why B is wrong? I wasn't sure if it was right or wrong when I did this question.

I think the arrow for $\ce{O2}$ just means there's oxygen gas in that part of the apparatus.
$$\ce{H2O2 + 2H+ + 2e- -> 2H2O} (\Delta E^{\circ} = +1.78)$$ $$\ce{H2O2 -> O2 + 2H+ + 2e-} (\Delta E^{\circ} = -0.7)$$
so the net reaction is $$\ce{2H2O2 -> O2 + 2H2O} (\Delta E^{\circ} = +1.08)$$
Since $\Delta E^{\circ}$ is positive, this reaction is spontaneous.