When landing a floatplane on choppy, unprotected coastal waters, which performance characteristic is most directly attributable to its float construction compared to a hull-type seaplane?

The step in the bottom of a seaplane's float or hull, located aft of the center of gravity, primarily affects performance by

Refer to the following performance chart for two float constructions: Water Conditions | Flat-Bottom Floats Planing Speed (kts) | V-Bottom Floats Planing Speed (kts) Calm | 35 | 42 Choppy | 45 | 40 Which float construction provides the best performance (lowest planing speed) for takeoff on calm water?

A seaplane's floats are constructed to provide buoyancy equal to 125 percent of the maximum gross weight of 2,560 pounds in seawater (density = 64 lb/ft³). The total displacement volume of the floats is