Social equality is the principle where all individuals within a society have equal rights, opportunities, and status, free from discrimination based on factors like caste, race, religion, gender, etc. Option C directly reflects this by stating that no person should face inferiority due to these social markers. Option A describes a rigid social hierarchy, the opposite of equality. Option B suggests maintaining the status quo, which is irrelevant to the definition of equality. Option D describes affirmative action, a measure to achieve equality, but not its definition.