Which of the following practices is essential for the safety of gas appliances?

Routine inspections and proper shutoff placement are vital for the safety of gas appliances because they help ensure that these appliances are functioning correctly and safely. Regular inspections can identify any potential issues such as gas leaks, faulty connections, or malfunctioning components before they pose serious risks, such as fires or explosions.

Moreover, having a proper shutoff valve that is easily accessible allows for quick response in case of emergency situations, enabling individuals to promptly turn off the gas supply to prevent further danger. This proactive approach to maintenance not only ensures the appliances operate efficiently but also safeguards the inhabitants by minimizing the risk of hazardous incidents associated with gas appliances.

The other options do not focus on the critical safety measures associated with gas appliances, making them less relevant in this context.