The question is comparing the man in two different timelines:
Timeline 1 i.e. Preagricultural Society
Social Roles were few, could be predicted for each phase. Therefore, interpersonal relations were stable and predictable.
Timeline 2 i.e. Modern Society
Social Roles are in thousands and lifestyle require that each of us fill those roles. Therefore, relations will not be so stable.
(A) modern society is characterized by greater injustice and unpleasantness than were preagricultural societies
Incorrect(B) interpersonal relations in modern societies are less stable and less predictable than they were in preagricultural societies
Correct(C) the most important difference between modern and preagricultural societies is the variety and type of social roles permitted in each
Incorrect(D) in modern societies, people must rely on technology to effectively predict and interpret other people’s actions
Incorrect(E) preagricultural societies lacked the complex social system that is needed to provide each person with an appropriate and stable social role or niche
Incorrect