Material that is thrown out by a volcano , including Pyroclastic material ( Tephra ) and lava bombs. Eruptionsearch for term. The process by which solid, liquid, and gaseous materials are ejected into the earth's atmosphere and onto the earth's surface by volcanic activity.
I would say maybe A. I may be wrong though. If you look up the definition for Fueling it would be to cause a fire intensely. And igniting is to catch fire or cause to catch fire.
