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$f(x)=(5 x+1)(4 x-8)(x+6)$ has zeros at $x=-6, x=-\frac{1}{5}$, and $x=2$.$\newline$What is the sign of $f$ on the interval $-\frac{1}{5}<x<2$ ?$\newline$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.