Answer: choice B.)
Reasoning:
Remember, the domain of a function is the set of all x-values that produces a corresponding range value (y-value). In other words, the domain is spread of the x-coordinate in the coordinate pairs of a function. So, in this case, the x-axis relates to the number of people who purchased a pass. Thus, the domain must relate to the number of people who purchased a pass. We are given a maximum of 75 people, and because we have multiple domain values (x-values) that can satisfy this range, an inequality is used. This is shown as answer choice B.) because 0 is greater than or equal to zero and less than 75, and 75 is less than or equal to 75.