Final answer:
b.baccalaureate degree. The necessary basic preparation for public health nursing is a baccalaureate degree.
Step-by-step explanation:
The necessary basic preparation for public health nursing is a baccalaureate degree. Public health nurses play a crucial role in promoting and protecting the health of individuals, families, and communities. A baccalaureate degree in nursing provides students with the necessary knowledge and skills to work in various public health settings, such as community health centers, government agencies, or non-profit organizations.