You are performing a "stand-by" along with the fire department at a local county fair. since it is fall and the temperature is cool, the emergency crews are sitting in their ambulances. given this situation, what would contribute to an increase in the carbon monoxide levels in your ambulance?
a. being parked too close to a fire engine that is also running
b. having an exhaust system that discharges beyond the side of the ambulance
c. keeping the heater running while you are inside the ambulance
d. having had the ambulance tuned-up a week prior

A. Being parked too close to a fire engine that is also running.

Explanation:

How is carbon monoxide produced?

If wood,gas,oil,coal do not burn completely then carbon monoxide get produced.

In a poorly ventilated area where there is fire the oxygen is slowly exhausted until there is only carbon dioxide left in the room. As carbon builds up within the atmosphere of the room,the fuel doesn't get burnt completely and end up releasing carbon monoxide

forty niners migrated west due to gold discovery in california and it the west was a new place for hope this : )

explanation: