A Librarian Wants to Gather Data on the Number of Times

Multiple Choice

A librarian wants to gather data on the number of times books of fiction are checked out during the year. The library has 2000 books of fiction, of which 500 are murder mysteries, 400 are science fiction, and the rest are "other". She decides to sample 120 books. Suppose the librarian takes the next 120 fiction books that are turned in and calculates the average number of times these books were checked out in the last year. What sampling technique was used?

A) Self-selected sample
B) Volunteer sample
C) Convenience sample
D) Random sample