Over the course of a day, fans pour into a NASCAR venue at the rate of 8000 people per hour. The average rate at which fans leave the venue _____.

a. must be less than 8000 people per hour

b. must be exactly 8000 people per hour

c. must be more than 8000 people per hour

d. could be more or less than 8000 people per hour LO2-3 LO.1