A Man Is Found Dead with No Marks on His

Multiple Choice

A man is found dead with no marks on his body in a small enclosed furnace closet. The medical examiner rules death by hypoxia. However, the criminal investigation finds that the room has adequate air flow. What is the most reasonable explanation for the cause of death that should be investigated further?

A) There was too little oxygen in the room.
B) The furnace was faulty and burned up all the oxygen.
C) The furnace was faulty and released carbon monoxide, which accumulated in the closet.
D) There was too much carbon dioxide in the room.
E) The man strangled himself but the rope disappeared.