Answer:
A. Valid solution: (24, 4)
Explanation:
The wording "at least 20 cups of fruit juice" means the feasible solutions will be to the right of the line showing 20 cups of fruit juice. (Graphs A and D only.)
Any possible solution will be a point in the shaded area, hence the ordered pair (fruit juice, ginger ale) must have a first value that is between 20 and 32. Only Graph A has such a "valid solution."