What allows you to avoid carbon monoxide poisoning while driving?

Answer: B — Keeping windows slightly open when running the engine inside an enclosed space

The correct choice highlights the importance of maintaining proper ventilation to avoid carbon monoxide poisoning, especially when a vehicle is running in an enclosed space. Carbon monoxide (CO) is a colorless, odorless gas produced by the burning of fuel. When a vehicle is running in an enclosed area, such as a garage, the risk of CO buildup increases significantly. By keeping the windows slightly open, fresh air can flow into the vehicle and prevent the accumulation of carbon monoxide, reducing the likelihood of poisoning. Other options may not adequately address the risks associated with carbon monoxide exposure. For instance, turning off the engine periodically does not resolve the issue if the engine is running in a closed space since CO could still be present until the engine is turned off entirely. Using only the air conditioning in a vehicle won't help reduce CO levels if there is no fresh air intake. Lastly, having ventilation systems checked regularly is good practice, but it does not provide immediate protection against carbon monoxide when driving in an enclosed space.