What is an important factor to consider when handling CNG?

Answer: A — It is lighter than air

An important factor to consider when handling Compressed Natural Gas (CNG) is that it is lighter than air. This characteristic is crucial in safety protocols and emergency response planning. Since CNG rises rapidly and disperses into the atmosphere, it reduces the risk of accumulation in enclosed spaces, where it could reach explosive concentrations. Understanding this property helps drivers and handlers make informed decisions about the storage, transportation, and the necessary precautions when working with CNG, especially in areas with inadequate ventilation. In contrast to this, the properties mentioned in the other options do not contribute positively to the handling of CNG. For instance, CNG cannot be stored indefinitely due to factors such as degradation of the storage containers over time and the importance of regular inspections. It also does not have a higher density than air, which would increase the risks associated with leaks. Lastly, there are indeed necessary safety measures in place that are vital when managing CNG, such as proper ventilation and the use of specific equipment designed to handle gas safely.