Which of the following statements about fusion is correct?
it is not a naturally occurring process.
it is currently used as a source of commercial energy production on earth.
it can create heavier elements, like oxygen and nitrogen, from hydrogen and helium.
it is similar to radioactive decay in that it occurs on its own without stimulation.

The first point is correct

Explanation:

Unlike fission, which is similar to radioactive decay, fusion does not occur naturally and this is due to the strong repulsive electrostatic forces which pull the positively charged nuclei apart from coming together and collide for fusion to occur.

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.