(a) Is armed with explosives or a deadly weapon; or
(b) Causes physical injury to any person who is not a participant in the crime; or
(c) Uses or threatens the immediate use of a dangerous instrument; or
(d) Displays what appears to be a pistol, revolver, rifle, shotgun, machine gun or other firearm; or 2. The building is a dwelling. Burglary in the second degree is a class C felony.