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) ?
Definitions:
Compound Word
A word composed of two or more separate words that are combined to create a new word with a unified meaning.
Overconfidence
The tendency to be more confident than correct—to overestimate the accuracy of our beliefs and judgments.
Hiring Ability
The capacity or skill of a person or organization to identify, evaluate, and recruit suitable candidates for employment.
Confirmation Bias
The tendency to interpret, seek out, and create information that confirms one's preexisting beliefs or hypotheses.
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