Before drafting a complex synthesis essay about mental health apps in schools, a student sorts the source set below. Source A qualifies both supporters and critics by noting that usefulness depends on counseling access and crisis protocols. Source B analyzes budget and logistics to show how the plan may raise privacy concerns and risk replacing human support. Source C emphasizes testimony from people affected by the proposal who say it could provide low-barrier tools for tracking stress and seeking help. Source D frames the proposal as a way to provide low-barrier tools for tracking stress and seeking help while strengthening public trust. Source E treats the issue as context-dependent because usefulness depends on counseling access and crisis protocols. Source F warns that offering school-approved mental health apps to students could raise privacy concerns and risk replacing human support, limiting its practical reach. Which grouping creates the most defensible idea-based organization for synthesis, especially around source roles in a line of reasoning?