A student had already read some pages in a book when he created the model below. The model tracks p, the total amount of pages read if the student reads for h hours. p = 30 + 60

Which statement best explains the meaning of the slope in this model?
A. The student tends to read 30 pages per hour.
B. The student will have 60 pages left to read after half an hour of reading.
C. The student will have 30 pages left to read after 1 hour of reading.
D. The student tends to read 60 pages per hour.​