Critical Reasoning (CR) | Re: Between 7 A.M. and 9 A.M., on average 50 percent of the park

Between 7 A.M. and 9 A.M., on average 50 percent of the parking spaces at a parking lot near Stoneville International Airport were occupied. During these two hours approximately 8 cars were parked in the parking lot every 5 minutes. Between 9 A.M. and 11 A.M. of the same day, on average 70 percent of the parking spaces of the same parking lot were occupied, even though only 6 cars were parked every 5 minutes.

Which of the following, if true, helps to resolve the apparent discrepancy above?
(A)Fewer