Final answer:
'The ANA has existed for more than 100 years' (Option A) best illustrates the support for high standards of nursing practice, indicating a long-standing commitment to the profession's betterment and adherence to Kelly's characteristic of a profession having a supportive organization.
Step-by-step explanation:
One of the characteristics of a profession identified by Kelly is that there is an organization (association) that encourages and supports high standards of practice.
The concern for nursing meeting this characteristic that is illustrated by one of the options is related to the American Nurses Association (ANA).
The ANA, as a professional organization, has the mission to advance the nursing profession by fostering high standards of nursing practice, promoting a safe and ethical work environment, bolstering the health and wellness of nurses, and advocating on healthcare issues that affect nurses and the public.
Therefore, option A, stating that 'The ANA has existed for more than 100 years', best illustrates the support for high standards of practice within the nursing profession.
This longevity signifies a long-standing commitment to these goals. Options B, C, and D either depict potential shortcomings (such as lower membership rates or specialization of interest groups potentially overpowering general professional organizations) or misrepresent the ANA's objectives.
Hence, the correct answer is Option A.