If steel is denser than lake water, why can a boat float?

A. The average density of the boat, including the steel and air, is less dense than 1.00 g/cm³.
B. The average density of the boat, including the steel and air, is denser than 1.00 g/cm³.
C. Lake water is denser than pure water.
D, Steel has a special ability to float regardless of density.