Answer:
C. Plasma
Step-by-step explanation:
Plasma is a state of matter that is similar to gas, but typically at a higher temperature. The primary difference between a plasma and a gas is that plasma is a mixture of electrons and positively charged gas ions. The electrons come from collisions between the gas particles; the collisions are so strong that they cause electrons to break free of the gas particles.
Most lighted signs have some kind of gas inside of them, such as neon. These signs are connected to an electrical plug or a battery. When the sign is switched to "on," an electrical current will move through the gas, causing it to become plasma.