Which of the Following Is NOT One of the Differences

Which of the following is NOT one of the differences between nuclear fission and nuclear fusion?

A) Nuclear fission uses uranium atoms, while nuclear fusion uses hydrogen atoms.
B) Most modern reactors use nuclear fission rather than nuclear fusion.
C) In nuclear fusion, atom nuclei are split, while in nuclear fission, atom nuclei are joined.
D) Nuclear fusion has a greater potential than nuclear fission.