smc

Note that for all roots $x$, $-x$ will also be a root. Therefore, the sum of all of the roots will be $0$, making the answer $\boxed{C}$ We can find all roots $x$ by setting $|x|=y$. This gives us the equation $y^2+y-6=0$, which has the solutions $y=-3,2$. However, $|x|$ cannot equal $-3$, so the roots for $x$ are $2$ and $-2$. The sum of the two roots is $0$, making the answer $\boxed{\text{the sum of the roots is }0}$.