A Community Health Task Force Is Preparing to Launch a Campaign

A community health task force is preparing to launch a campaign promoting obesity awareness and education in the area.  The task force studies epidemiologic data from the county health department, which show that the prevalence of obesity is 3 times higher in a cluster of 5 specific ZIP codes compared to the county average.  The task force leader approaches a reputed physician working at a local university to ask for assistance in understanding this pattern.  Which of the following should be performed first to understand the etiology of the disparity in obesity prevalence?

A) Cross-sectional analysis of demographic attributes and health behaviors across community ZIP codes
B) Observational study tracking leptin levels and weight outcomes in a representative cohort of community residents
C) Quality improvement study assessing medical provider adherence to national obesity screening, monitoring, and treatment guidelines across ZIP codes
D) Qualitative survey assessing obesity-related beliefs, attitudes, and knowledge in a representative community sample
E) Randomized controlled trial examining the relationship between primary care weight counseling and obesity incidence

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