Why is Johnny not qualified to work as a public-school teacher?

To work as a public-school teacher, one must typically have at least a bachelor's degree in education or a related field that prepares them for teaching. This foundational requirement is essential because it ensures that teachers possess the necessary knowledge and skills to effectively educate students. Without a bachelor's degree, Johnny lacks the academic qualifications needed for certification and employment in this role.

While lacking a master's degree or having a degree in an unrelated field might pose challenges for specific teaching positions or career advancement opportunities, the fundamental barrier to entering the profession is not holding a bachelor's degree. Therefore, the correct answer reflects the essential qualifications required to work as a public-school teacher.