100% short length
100% medium length
100% long length
50% long , 50% short

100% medium

Explanation:

Since you got all Hh which equals medium it means all are going to be that.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.