Correct option is C
Ammonia (NH₃) is one of the most commonly used refrigerant gases in large industrial refrigeration systems, including cold storages. It has excellent thermodynamic properties, high energy efficiency, and low operating costs. Ammonia is environmentally friendly because it has zero ozone depletion potential and zero global warming potential. Its strong odor also acts as a warning in case of leaks. However, ammonia is toxic and requires careful handling in controlled environments. Due to its effectiveness and widespread use in cold storage systems
