When Trying to Stimulate Breathing,it Is Better to Give a Mixture

When trying to stimulate breathing,it is better to give a mixture of carbon dioxide and oxygen than only oxygen because

A) pure oxygen causes you to breathe too rapidly.
B) carbon dioxide and oxygen together exert a greater pressure than an equal amount of oxygen.
C) carbon dioxide buildup in the blood stimulates the respiratory center in the brain.
D) oxygen causes lactic acid buildup,and the change in pH prevents breathing.
E) oxygen alone could lead to spontaneous human combustion.