The Transportation Method Is a Linear Programming Technique

The transportation method is a linear programming technique. Linearity is present in the following way:

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