Which condition should be avoided when storing an emergency oxygen system?

The correct answer is based on the importance of maintaining the integrity and functionality of the emergency oxygen system. Exposure to extreme temperatures can adversely affect both the physical components of the system and the oxygen itself. High temperatures can lead to the over-pressurization of oxygen cylinders, while extremely low temperatures can cause the gases to condense and affect the delivery system. Maintaining a stable and appropriate temperature range ensures that the system operates reliably when needed, making it a critical factor in storage considerations.

Regarding the other options, while darkness, high humidity levels, and placement near liquids may have some impact, they do not pose the same level of immediate risk as extreme temperatures. For instance, darkness is generally not harmful to oxygen systems, and while high humidity might cause corrosion or affect some components over time, it is more manageable compared to the effects of temperature fluctuations. Placement near liquids could pose a risk but is more situational and depends on the liquid and its properties. Ultimately, extreme temperature concerns take precedence in ensuring the safety and reliability of an emergency oxygen system.