How is CNG classified in terms of its transport characteristics?

Compressed Natural Gas (CNG) is primarily composed of methane and exists as a gas in its natural state. However, when compressed, it is stored under high pressure, which can create hazardous situations if not managed properly. While CNG is indeed flammable, it is important to recognize that its state during transportation is that of a gas, albeit a compressed one.

The classification underscores the importance of handling CNG with care, particularly concerning its high-pressure storage. Mismanagement of CNG can lead to explosive risks if there is a leakage or rupture in the transport system, qualifying it as hazardous despite being a cleaner fuel alternative. Thus, option B accurately reflects the nature of CNG's transport characteristics, emphasizing both its non-flammable nature as a gas and the hazards associated with high-pressure storage.

Other classifications such as calling it a highly flammable liquid or classifying it as a solid for transportation misrepresent its actual state and risk profile. Additionally, the idea that it is completely safe with no transport regulations disregards the necessary safety protocols required for handling and transporting CNG.