Grant valley school has hired a fleet of busses and vans to transport 96 students to a picnic . each bus can seat 31 people , and each van can seat 9 people . the school authorities want to have 3 teachers traveling in each bus and one teacher in each van . it will take to accommodate 107 people , including the students and teachers with no seats vacant. a. 2 busses and 4 vans b. 3 busses and 2 vans c. 2 busses and 2 vans d. 1 bus and 4 vans e. 2 busses and 5 vans