What does a boat-mounted tank typically indicate?

A boat-mounted tank is commonly designed for effective transportation and application of liquids, particularly in the context of aquatic weed control. The correct answer indicates that these tanks usually have a capacity ranging from 50 to 100 gallons. This range is practical for managing the volumetric needs of the spraying systems used in weed control applications while ensuring that the equipment remains manageable and stable on a vessel.

Having a capacity in this range allows for sufficient pesticide or herbicide to be carried for extended treatments, without the tank becoming overly cumbersome or heavy, which could affect the vessel's buoyancy and handling in the water. The other options do not accurately represent the primary function or characteristics of a boat-mounted tank in this context.