Final answer:
Becca is in the pre-conventional stage of Kohlberg's moral reasoning, where her behavior is motivated by avoiding punishment or gaining rewards.
Step-by-step explanation:
Becca's primary concern with ethical behavior, which is centered on avoiding punishment or gaining rewards from her parents, places her in Lawrence Kohlberg's stage of pre-conventional morality. At this level, individuals make moral choices based mainly on personal consequences, such as receiving a punishment or reward, rather than internalizing societal norms or laws. This stage is typically seen in young children, but as Kohlberg noted, people's moral reasoning in different situations can vary and doesn't always correspond to their development stage.