Final answer:
The correct answer is c. American Dental Hygienists Association. The American Dental Hygienists Association is the professional association responsible for providing a code of ethics for dental hygiene professionals.
Step-by-step explanation:
The professional association that provides the code of ethics for the dental hygiene profession is the American Dental Hygienists Association (ADHA). Professional societies like the ADHA develop codes of ethics to delineate the professional behaviors and responsibilities expected of their members. Adherence to these ethical standards is crucial for maintaining public trust and professional integrity within the profession. Therefore, the correct answer would be c. American Dental Hygienists Association.