An Arsonist Set Fire to a Building

An arsonist set fire to a building. He claims to have believed the building was empty, but several homeless people were staying there. One was killed in the fire. What must the prosecutor prove to convict the arsonist of violent arson?

A) The prosecutor must only prove the arsonist set the fire.
B) The prosecutor must prove the arsonist set the fire and intended to kill a person by doing so.
C) The prosecutor must prove the man set the fire with reckless disregard for any people inside.
D) The prosecutor must only prove the arsonist deliberately set the fire.
E) none of the above