If the reaction 2HgO --> 2Hg + O2 is endothermic, which bonds are the strongest?

The bonds between Hg atoms in the solid metal.
The bond between Hg & O.
The bond between O & O.

The strongest bonds would be the bonds between Hg atoms in the solid metal. These bonds require a significant amount of energy to break and would be the most stable in this reaction.