Where the argumentative text is given, the text that best supports her claim is "A research journal revealing data that both traditional and year-round schooling have the same impact on student growth" (Option C).
Option C is the best supporting sentence because it provides empirical evidence through a research journal.
The data indicating that both traditional and year-round schooling have the same impact on student growth directly supports Melia's argument that year-round schooling is not the solution to the decline in student achievement and engagement.
This objective information from a research study adds credibility to her claim, making it a stronger and more convincing argument against the perceived benefits of year-round schooling.