AMC 12 2004b Problem 18

Points $A$ and $B$ are on the parabola $y=4x^2+7x-1$, and the origin is the midpoint of $AB$. What is the length of $AB$?

$\mathrm{(A)}\ 2\sqrt5 \mathrm{(B)}\ 5+\frac{\sqrt2}{2} \mathrm{(C)}\ 5+\sqrt2 \mathrm{(D)}\ 7 \mathrm{(E)}\ 5\sqrt2$