Which of the following describes the process of mixing a lime agua fresca, which is 8% juice, with a cherry agua fresca, which is 28% juice, to create a 20% juice mixture totaling 20 fluid ounces?

a) Determining the ratio of lime to cherry agua fresca based on their juice concentrations.
b) Calculating the total volume of each type of agua fresca needed to achieve the desired mixture.
c) Solving a system of equations to find the appropriate amounts of each agua fresca.
d) Assessing the environmental impact of mixing different types of agua fresca.