A school sells adult tickets and student tickets for a play. It collects $1,400 in total. Graph. Adult tickets sold. Student tickets sold. The graph shows the possible combinations of the number of adult tickets sold and the number of student tickets sold. What does the vertical intercept (0, 200) tell us in this situation? A: It tells us the decrease in the sale of adult tickets for each student ticket sold. B: It tells us the decrease in the sale of student tickets for each adult ticket sold. C: It tells us that if no adult tickets were sold, then 200 students tickets were sold. D: It tells us that if no students tickets were sold, then 200 adult tickets were sold.