What is one of the major features of quints?

Answer: B — Size of the water tank

One of the major features of quints is the size of the water tank. Quints are specialized fire apparatus that combine the capabilities of a ladder truck and a pumper. The water tank is a critical component because it provides the necessary water supply for firefighting operations, allowing firefighters to respond quickly to emergencies without waiting for additional resources. A larger water tank can significantly enhance the effectiveness of quints in dealing with fires, particularly in areas where access to hydrants may be limited. The other options listed, while they may be features of some aerial apparatus, do not define the quint's primary function or its distinguishing characteristics as clearly as the water tank does. Quints are specifically designed for versatility in firefighting, and the size of their water tank directly impacts their operational efficiency.