F(x) = x^2(x + 2) ( x - 2) ( x - 5) has zeroes at x = -2, x = 0, x = 2, and x = 5. What is the sign of f on the interval -2 < x < 5?
A. f is always positive on the interval
B. f is always negative on the interval
C. f is sometimes positive and sometimes negative on the interval