Answer
$C.$
Work Step by Step
Axis of symmetry is parallel to the $x$ -axis, opens left.
According to Table 2,
Equation: $(y-k)^{2}=-4a(x-h)\quad $
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Vertex:$\quad (h,k)=(0,0)$,
so look for $y^{2}=-4ax\quad $.... choice $C.$
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