Answer:
The height from which the ball is thrown. Option B is correct.
Explanations:
Given the function of the height of the ball tossed by Carrie expressed as:

The x-intercept of a function is the point where h(x) = 0.
Since h(x) is the height of the object where x is the number of seconds, hence the x-intercept of h(x) represents the height from which the ball is thrown (From the ground)