Write an Equation for the Parabola with Vertex at the Origin

Multiple Choice

Write an equation for the parabola with vertex at the origin.
-Focus $\left( - \frac { 1 } { 7 } , 0 \right)$

A) $y ^ { 2 } = - 28 x$
B) $y ^ { 2 } = - \frac { 4 } { 7 } x$
C) $x ^ { 2 } = - \frac { 4 } { 7 } y$
D) $x ^ { 2 } = - 28 y$