How Can the Concept of a Career Ladder in Education

How can the concept of a career ladder in education best be described?

A) Specialized programs for associate degree or diploma registered nurses (RNs) to attain a baccalaureate degree
B) The ability of staff nurses to be promoted based on their clinical skills
C) The relationship between one level of nursing education and the next level of education
D) After nurses pass the NCLEX examination, they are all considered professionals