A Campaign Manager for a Political Candidate Must Arrange the Shipment

Multiple Choice

A campaign manager for a political candidate must arrange the shipment of 150 cartons of campaign buttons from three button producers to three campaign headquarters.The supplies and demands,and the per-carton transportation costs,are shown below: Which of the following is a constraint for the customer (campaign headquarters) ?

A) 2X11 + 9X21 + X31 = 20
B) 5X12 + 3X22 + 8X32 = 70
C) X11 + X12 + X13 = 50
D) X12 + X22 + X32 = 70
E) All of the choices are correct.