What is the equation of a parabola with vertex (0, 0) and focus (0, 3)?

✓ Correct Answer: Option A

With vertex (0,0) and focus (0,3), the parabola opens upwards. The standard form is x² = 4py. The distance p from the vertex to the focus is 3. Substituting p=3 gives x² = 4(3)y, or x² = 12y.