Which of the following statements gives the least justification for engineering or geoscience professionals to...

The least justification for considering engineering or geoscience professionals as "professional" comes from their ability to be self-employed and work directly with clients. While this is a feature of professional work, it does not inherently require or ensure adherence to a high standard of ethical or professional conduct, nor does it necessitate specialized knowledge or responsibility to the public. In contrast, statements B, C, and D directly relate to the core definitions of professionalism, including responsibility to the public, specialized knowledge, and regulation by professional standards, which are key elements that define a profession in a traditional sense​​.