The best title for this passage might be______.

A．There can never be a unanimous consensus concerning the identity of individuals or groups in a modern society.
B．A modern society is characterized by disorder, as there is no common morality and consensus.
C．In a modern society people obey rules mostly on the basis of their deep moral conviction.
D．A modern society needs no moral solidarity when it is threatened by grave internal or external perils.

A．academic discussions on related issues
B．debates on some big topics
C．quarrels about a small detail
D．personal remarks on issues concerned