The answer is :
↬ He doesn't have enough info
Explanation:
To write the equation of a parabola, you need the equation
. You need to know the values of a, b, and c in order to write the equation. So knowing only the y-intercept (0, 5) will not suffice. He knows where the parabola intersects the y-axis yet he isn't aware of the appearance of the parabola and how to draw it.
Hence, he doesn't have enough info.