The Transportation Method Is a Linear Programming Technique Where Linearity

The transportation method is a linear programming technique where linearity can be found in which of the following ways?

A) The cost of goods shipped from any source to any destination is a linear function of quantity shipped.
B) The total cost associated with a given plan is a linear function of shipping costs.
C) Cell evaluations assume linear movements through the matrix.
D) The cost of goods shipped from any source to any destination is a linear function of the cost per unit.