Choice “B” is incorrect.  Neutral particles which move freely would best describe a gas.  It could also describe a liquid since liquid particles have considerable freedom of movement as well, relative to a solid.  Choice “B” is not a plasma since the particles of plasma are generally charged, not neutral.  Plasma particles do have great freedom of movement and, in that sense, are similar to a gas.  If you wish to review your snapshots to see the similarities between gases and plasma, click on “Snapshots” in the top menu bar.