Answer:
C) 5 seconds
Explanation:

When the ball hits the ground, the height is 0.

Factor out the greatest common factor: 16

Find numbers whose sum is -5 and product is - 4.
Those numbers are - 5 and 1: - 5 × 1 = - 5, - 5 + 1 = - 4


Or

So,

Or

Since time cannot be a negative value the correct answer is 5 seconds.