The linear model represents the height, f(x), of a water balloon thrown off the roof of a building over time, x, measured in seconds. During what interval(s) of the domain is the water balloon's height increasing?
A. 0 ≤ x ≤ 2
B. 40 ≤ y ≤ 70
C. 5 ≤ x ≤ 8
D. 40 ≤ y ≤ 10
