Answer
(G)
Work Step by Step
1. The parabola in this graph opens to the left, thus it has a general equation $4p(x-h)=-(y-k)^2$
2. Use the vertex $(1,1)$ on the curve, we have $4p(x-1)=-(y-1)^2$ 3. Use the point $(0,3)$ on the curve, we have $4p(0-1)=-(3-1)^2$,
thus $p=1$ 4.
3. Thus the answer is (G)