The models below represent nuclear reactions. The atoms on the left of the equal sign are present before the reaction, and the atoms on the right of the equal sign are produced after the reaction.
Model 1: Atom 1 + Atom 2 = Atom 3 + energy
Model 2: Atom 4 = Atom 5 + Atom 6 + energy

Which of these statements is most likely correct about the two models?

A: Both models show reactions which produce energy in the sun.

B: Both models show reactions which use up energy in the sun.

C: Model 1 shows reactions in the nuclear power plants and Model 2 shows reactions in the sun.

D: Model 1 shows reactions in the sun and Model 2 shows reactions in a nuclear power plant.