What could be a consequence of a malfunctioning safety valve in the air system?

Answer: B — Over-pressurization of the system

A malfunctioning safety valve in the air braking system can lead to over-pressurization of the system. The safety valve is designed to release excess pressure to prevent damage to the components of the air brake system. If this valve fails to open when the pressure exceeds a certain level, it can allow pressure to build up unchecked. Over-pressurization can cause various problems, including potential ruptures of air tanks or damage to hoses and other system components. This can compromise the entire braking system's effectiveness, posing a significant safety risk to the vehicle and its occupants. In contrast, increased stopping power, improved response time, and increased air tank capacity would not directly result from a malfunctioning safety valve; in fact, these outcomes are typically associated with well-functioning systems.