Final answer:
A violation of ethical standards most likely occurs when a CPA refuses to hire someone based on age, which is discriminatory and against professional codes of ethics.
Step-by-step explanation:
The violation of the profession's ethical standards would most likely occur when a CPA refuses to hire a new employee solely based on the perception that the candidate is "too old." This action would potentially violate ethical standards regarding non-discrimination and equal opportunity. Professional organizations, including those in business and accounting, have codes of ethics that their members are required to adhere to.
Such codes often include provisions that prohibit discrimination based on age, among other factors. Professional ethics extends beyond avoiding conduct that is legally prohibited, focusing also on the higher standards of conduct that are expected in a given profession. Ethical behavior in the workplace and while representing one's profession is fundamental in maintaining public trust and upholding the integrity of the profession.