Your Answer is

Correct Answer is A

Explanation

According to the analytical formula, it can be seen that this is a parabola with the opening facing downward. So h takes its maximum value at the vertex. The analytical formula can be transformed into h=t (3-t) so the parabola intersects the x-axis at (3,0), (0,0). The abscissa of the vertex is the average of the abscissa of these two points, which is 1.5. < /p>