What are the potential hazards associated with compressed gas cylinders?

The correct choice acknowledges the various hazards associated with compressed gas cylinders, which include both the risk of explosion and physical injury. Compressed gas cylinders are under high pressure, and if they are damaged, subjected to extreme temperatures, or improperly handled, they can rupture or explode, potentially causing significant harm to individuals nearby.

Additionally, physical injury may occur from the cylinder itself if it is dropped or falls over, which can lead to severe accidents. It is important to recognize that these risks are inherent in the storage and use of compressed gases, necessitating careful handling and adherence to safety protocols to mitigate the dangers.

Considering this, the other options are too narrowly focused. Focusing solely on physical injury from falling cylinders or gas leaks neglects the more comprehensive understanding of the potential for both explosions and significant accidents from improper cylinder management. Similarly, only mentioning the risk of contamination fails to encapsulate the broader range of hazards, particularly the physical dangers posed by the high-pressure cylinders.