The ___ nozzle will discharge a wide range of flows with an effective fire stream.

The automatic nozzle is designed to adjust water flow based on the pressure available in the firefighting system. This capability allows it to provide a wide range of flows while maintaining an effective fire stream, regardless of fluctuations in water pressure. When firefighters adjust the nozzle, it can automatically increase or decrease the flow rate, enabling adaptability in various firefighting scenarios. This feature is particularly beneficial in dynamic environments, where conditions may change rapidly and require different levels of water delivery for effective fire suppression.

In contrast, other nozzle types do not offer this level of adaptability. The set gallonage nozzle delivers a fixed flow rate, solid nozzles maintain a specific, non-variable stream, and proportioners are designed for mixing agents but do not directly focus on flow variability. Thus, the automatic nozzle stands out for its flexibility in flow control, making it the correct choice for this question.