Correct option is D
In chemistry, concentration refers to the amount of solute present in a given quantity of solvent or solution. It is often expressed in units such as molarity (moles of solute per liter of solution) or mass/volume percentage. It provides a measure of how much solute is dissolved in the solvent. Therefore, concentration of solution is the most appropriate term here, as it encompasses both mass and volume measurements of solute within the solvent.
Thus, the correct answer is (d) Concentration of solution.
