Text stimulus (table): Source matrix titled Data sources for transit pass and attendance study. Columns: Source, What it measures, Strength, Limit. Rows: Attendance records, days present and absent by student ID, accurate recorded attendance, sensitive identifiers; Transit pass logs, pass taps by date and anonymous card ID, detailed use events, may count taps not riders without linkage; Student survey, reasons for using or not using pass, captures explanations, self-report limits; Census demographics, neighborhood population context, broad background, no attendance or pass-use variables. Additional evidence: footer: the display uses only with approved de-identified linkage when needed. A student asks whether transit pass use is related to school attendance and how students explain using or not using the pass. Which plan best fits the question while respecting data limits?