Answer:
A). Considering fairness to others.
Explanation:
According to Kohlberg's model of moral development, the major distinction between the stage 2 in which the individual reflects an egoistic positioning and aims to prefer his self-interest over the others' needs or desires and the stage 3 in which the social conformity and interpersonal relationships become more important. The major distinction between the two phases is based on 'considering fairness to others' where the former(stage 2) offers lesser concern towards others' needs while the latter(stage 3) focuses more on social requirements. Thus, option A is the correct answer.