which best describes concentration?\nthe mass of the solution\nthe amount of solutes in a solution

Brief Explanations:

Concentration refers to the amount of solutes relative to the amount of solvent or solution. It is not just the mass of the solution or only the amount of solutes without context. But among the given options, the amount of solutes in a solution is more related to the concept of concentration as it is a key - factor in determining concentration levels.

Answer:

The amount of solutes in a solution