Which of the following example indicates a "randomized controlled experiment"? A. Canadian households receive a tax rebate in one year but not the other. B. A group of 5th graders in a specific elementary school in Ontario are allowed to use computers at school while others are not, and their end-of-year performance is compared holding constant other factors. O C. One Canadian province increases minimum wages, and an adjacent one does not, and employment differences are observed. D. A situation where random variables are controlled for by holding constant other factors.

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