A function, f(x), models the depth of water in a wading pol that is filling at a rate of 11 gallons per minute. which of these describes why f(x) can be considered a linear function. I. Fore every 1-minute interal the depth of water in the wading pool increasews by the same amount.
II. The function grows by equal factors every minute.
III. The slope of the function is constant.
A. I only
B. I and III only
C. II and III only
D. I, II, and III