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 Estimate the size of a crowd at an outdoor concert venue that occupies a rectangular space with dimensions of 300 feet by 500 feet (to the nearest whole number). Assume that 5 people occupy a square measuring 5 feet by 5 feet.
 A. 15,000 people
 B. 20,000 people
 C. 25,000 people
 D. 30,000 people