What can be performed to prevent asphyxiation from occurring?

Increased ventilation is the correct answer because enhancing the airflow in a space reduces the likelihood of asphyxiation, which can occur due to a lack of oxygen or the presence of harmful gases. Proper ventilation helps to dilute and remove any toxic or suffocating gases, ensuring that there is a sufficient supply of breathable air.

While warning signs, regular training, and emergency drills are important safety measures in the workplace, they do not directly prevent asphyxiation. Warning signs may raise awareness of potential hazards, but they do not change the physical environment. Regular training contributes to overall safety knowledge, but again, it does not actively improve air quality or prevent gas buildup. Emergency drills prepare individuals for emergencies but do not influence the actual prevention of asphyxiation in a physical sense. Thus, increased ventilation is the most effective method to actively mitigate the risk of asphyxiation by ensuring adequate oxygen levels in the environment.