Some jovian planets give off more energy than they receive because ofa. fusion in their coresb. tidal heatingc. ongoing contraction or differentiation

C. Ongoing contraction or differentiation

Explanation:

Some jovian planets give off more energy they recieve because of the additional energy they got from contraction or differentiation. For example jupiter is still under gravitational contraction.

the energy emission process is due to nuclear fusion

Explanation:

In the planetary system the energy emitted by bodies is a part of the energy received by a hot body (star), this star is what creates the entire energy cycle of a given planet. This creates the entire tidal movement, continental drift

If the planets reach a certain size the gravitational force near their center is so great that the atoms are crushed and some beginnings of fusion processes are formed where some atoms are transformed from hydrogen to helium releasing a certain amount of energy and heat that believe that the planet emits more energy than it receives from its star.

In summary, the energy emission process is due to nuclear fusion