Lakewood High School is taking 250 students on a field trip to the natural science museum downtown. The school can use buses that seat 60 students each and vans that seat 8 students each.

Which pairs (b,v) represent possible numbers of buses and vans the school can use to take the students to the museum?

a. (0, 30)
b. (3, 9)
c. (3, 8)
d. (2, 16)