Which of the Following Is Not an Assumption of the Transportation

Multiple Choice

Which of the following is not an assumption of the transportation model?

A)  Actual supply and demand must be equal.
B)  Shipping costs per unit are constant per unit.
C)  Items to be shipped are homogeneous.
D)  There is only one transportation route between each source and destination.
E)  There is only one transportation mode between each source and destination.