A study was conducted to determine the relationship between the outdoor temperature and the number of visitors to a municipal swimming pool.
What are the independent and dependent variables for this study?

A. The independent variable is the size of the pool, and the dependent variable is the number of visitors to the pool.

B. The independent variable is the number of visitors to the pool, and the dependent variable is the size of the pool.

C. The independent variable is the outdoor temperature, and the dependent variable is the number of visitors to the pool.

D. The independent variable is the number of visitors to the pool, and the dependent variable is the outdoor temperature.

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