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$f(x)=(2 x-1)(3 x+5)(x+1)$ has zeros at $x=-\frac{5}{3}, x=-1$, and $x=\frac{1}{2}$.$\newline$What is the sign of $f$ on the interval $-\frac{5}{3}<x<\frac{1}{2}$ ?$\newline$Choose $1$ answer:$\newline$(A) $f$ is always positive on the interval.$\newline$(B) $f$ is always negative on the interval.$\newline$(C) $f$ is sometimes positive and sometimes negative on the interval.