In Which of the Following Nuclear Processes Are Other Forms

In which of the following nuclear processes are other forms of energy converted into nuclear energy? In other words, in which of these processes is nuclear energy created?

A) Exothermic ["heat producing"] chemical reactions.
B) Endothermic ["heat consuming"] chemical reactions.
C) In nuclear fission of the lighter elements and nuclear fusion of the heavier elements.
D) In nuclear fusion of the lighter elements and nuclear fission of the heavier elements.
E) Supernova explosions, i.e., explosions of stars.