What Repulsive Forces Must Be Overcome for Any Element Other

Multiple Choice

What repulsive forces must be overcome for any element other than hydrogen to exist?

A) The repulsion between neutrons and other neutrons.
B) The repulsion between protons and other protons.
C) The repulsion between protons and neutrons.
D) The repulsion between positrons and electrons.
E) The repulsion between neutrons and electrons.