Mills Argued That the Members of the Ruling Elite Interact

Mills argued that the members of the ruling elite interact with each other, their children go to the same schools, and they do business together. Hence, these people who are the inner circle of the upper social classes tend to see the world alike. This idea is the basis of which of his factors of unity?

A) Pyramid of power
B) Psychological similarity
C) Social interaction
Bias
D) Coinciding interests