Question: What is the best study design to determine whether cities with a higher percentage of college graduates had fewer obese adults over the past 40

What is the best study design to determine whether cities with a higher percentage of college graduates had fewer obese adults over the past 40 years? You plan to compare all the cities in Europe and North America that have populations of over 100,000 residents.

Group of answer choices

An ecological study

A case report

A cluster-randomized trial

A multi-level observational study

A multi-site trial

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