The risk of carbon monoxide poisoning can be reduced by

a. never leaving a car running in a garage
b. never backing a vehicle into a garage
c. turning on the air conditioner
d. keeping your ventilating system on the lowest setting

Carbon monoxide is a highly toxic gas. The combustion engine used in cars can produce very high concentrations of CO. Those who work in the garage for a long period would breath a dangerous amount of CO. A. Never leaving a car running in a garage.

Answer///an appropriate hitch and safety chains should be used;