Final answer:
The conventional level of moral development is associated with conformity to social rules and societal standards, typically developing during the teen years. So, the correct answer is option b.
Step-by-step explanation:
Moral reasoning based on conformity with social rules is characteristic of the conventional level of moral development. Lawrence Kohlberg's theory of moral development defines this conventional level as the stage where individuals are increasingly aware of others' feelings and societal expectations.
During this period, generally in the early teen years, young people begin to adhere to and support the rules and norms of society. They determine what is 'good' and 'bad' by referring to these societal standards. Moreover, at this stage, they tend to prioritize interpersonal relationships and the maintenance of social order. So, the correct answer is option b.