Question

method of sorting object by buoyancy (ability to sink or float in water)○ flotation○ solute○ solution○ mixture

Explanation:

Flotation is the process of sorting objects based on their buoyancy (whether they sink or float in water). A solute is a substance dissolved in a solvent, a solution is a homogeneous mixture of solute and solvent, and a mixture is a combination of substances without chemical bonding, none of which describe this sorting method.

Answer:

A. flotation