Answer:
Gas
Step-by-step explanation:
Solid particles cannot travel far, since they are mostly attracted together.
Liquid Particles cannot travel far either, although they can flow, but they flow with respect with gravity.
Plasma... is a very hot material, it's probably cooler than the sun but it's way warmer than your average boiling water.
So which leaves gas, since we know that the properties of gases are :
Gas particles can freely travel
Gas particles are spread out
These enables it to flow around the room, and this has something to do with diffusion, but i believe it's out of topic.
So, the answer's gas!
HOPE THIS ANSWER HELPED :)