A political scientist is interested in the effect of government type on economic development, She wants to use a sample of 30 countries evenly represented among the Americas, Europe, Asia, and Africa to conduct her analysis. What type of study should she use to ensure that countries are selected from each region of the world?   a. Observational - simple random sampling   b. Observational - cluster sampling   c. Observational - stratified sampling   d. Experimental

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