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Which of the following numbers is irrational?


a fraction with numerator negative 9 and denominator 5, a fraction with numerator square root of 5, a fraction with numerator 7 and denominator 3, square root of 9

Aa fraction with numerator negative 9 and denominator 5
Bsquare root of 5
Ca fraction with numerator 7 and denominator 3
Dsquare root of 9