Answer:
D. economies of scale
Explanation:
A. empowerment. When the employees are given the means, oportunity and responsability they are more productive, this may play a role in this, but it's not what the example is about
B. unity of command. This would require that, in the example, Ray would keep command of the three locations, also, this is not what the example is about
C. bureaucracy. This would mean a set of rules to guide action, again, not what the example is about
D. economies of scale. This is the answer, this means that, when achieved,the greater the quantity, lower the costs