What Is Meant by Murray Milner's Observation That "One's Own

What is meant by Murray Milner's observation that "one's own status is always at the expense of someone else's social position"?

A) Whether intentional or by accident, a person either displaces or blocks another in status.
B) We are all status seekers whether we like it or not.
C) It means that there are restrictions on social intercourse.
D) Social status is in short supply and ultimately unfair.