The process by which charged plasma particles
revert back to a gas

Plasma, in physics, an electrically conducting medium in which there are roughly equal numbers of positively and negatively charged particles, produced when the atoms in a gas become ionized. It is sometimes referred to as the fourth state of matter, distinct from the solid, liquid, and gaseous states.

answer; i believe that the correct answer is (a) potassium(k)

the answer would be b i believe