Nick volunteers at the library shelving books. The graph shows how many books Nick shelves one Saturday.

Graph of a diagonal line on a coordinate plane with ALTDCTime in hoursALTDC on x-axis and ALTDCNumber of BooksALTDC on y-axis. The diagonal line is going up and to the right. Line passes through points (0, 0), (2, 60) and (4, 120).

Part A
How many books does Nick shelve in 2 hours? Enter your answer in the box.

books

Part B
What does the point (3, 90) represent on the graph?
A.

Nick volunteers 90 hours in 3 weeks.
B.

Nick earns $90 in 3 weeks.
C.

Nick shelves 90 books in 3 hours.
D.

Nick shelves 90 books on 3 Saturdays.