When does a parabola open upward?

a.

when p is negative

c.

when p is positive

b.

when h is positive

d.

when h is negative

It so positive p I'm not for sure

it opens when it is positive because, here are the informational steps:

Step-by-step explanation:

If the x is squared, the parabola is vertical (opens up or down). If the y is squared, it is horizontal (opens left or right). If a is positive, the parabola opens up or to the right. If it is negative, it opens down or to the left.

so the answer is b) opens when positive