Answer:
c.mass of solute and volume of solution
Step-by-step explanation:
Given that:-
The concentration has to be calculated in grams per litre.
Grams per litre means that 1 gram of the solute present in 1 L of the solution. Thus, the expression for the calculation of the concentration in g/L is:-

Thus, the combination of the information we need to calculate the same is:-
c.mass of solute and volume of solution