Which two interconnected concepts does Carson McCullers develop in this excerpt from "Loneliness . . . an American Malady"?

The baby reaches for his toes, then explores the bars of his crib; again and again he compares the difference between his own body and the objects around him, and in the wavering, infant eyes there comes pristine wonder. Consciousness of self is the first abstract problem that the human being solves. Indeed, it is this self-consciousness that removes us from lower animals. This primitive grasp of identity develops with constantly shifting emphasis through all our years. Perhaps maturity is simply the history of those mutations that reveal to the individual the relation between himself and the world in which he finds himself. After the first establishment of identity there comes the imperative need to lose this new-found sense of separateness and to belong to something larger and more powerful than the weak, lonely self. The sense of moral isolation is intolerable to us.

A. the influence of family and society on personality
B. the effect that society has on an individual’s actions
C. the creation of individual identity and the need to belong
D. the loneliness and isolation experienced by all human beings