Final answer:
Bethany, a 17-year-old with strong mathematics abilities, has likely resolved the Identity vs. Role Confusion stage of Erikson's psychosocial development stages, which focuses on developing a strong sense of self during adolescence.
Step-by-step explanation:
Bethany, a confident 17-year-old comfortable with her mathematics aptitude, has likely resolved the Identity vs. Role Confusion stage of psychosocial development according to Erik Erikson. This stage is characterized by the development of a self-concept and personal identity, where adolescents typically face questions such as "Who am I?" and "What do I want to do with my life?" Success in this stage leads to a strong sense of identity, while failure results in role confusion and uncertainty about the future.
Adolescence (ages 12-18) is a crucial period for developing a sense of self, and achieving this allows teens to remain true to their beliefs and values. In contrast, the Industry vs. Inferiority stage occurs during elementary school (ages 7-11), where the focus is on building a sense of competence and achievement.