An object was thrown from the top of a building. The height of the object above the ground can be found using the function y = -2.5x +75, where x is the time in seconds the object has been in the air. What is the domain of the function for this situation?
a 0 ≤ x ≤ 30
b -2.5 ≤ y ≤ 75
c 0 ≤ x ≤ 72.5
d -187.5 ≤ y ≤ 2,250