Final answer:
The College of Nurses of Ontario (CNO) is the organization that regulates nurses in Ontario, ensuring they meet professional qualifications and ethical standards.
Step-by-step explanation:
The organization that regulates nurses in Ontario is the College of Nurses of Ontario (CNO). This regulatory body sets the standards for nursing practice and is responsible for issuing nursing licenses to practice in Ontario. It ensures that the nurses meet the necessary professional qualifications and follow the appropriate standards of practice and ethical conduct. Other organizations mentioned, such as the Registered Nurses Association of Ontario, the Ontario Nurses Association, and the Canadian Nurses Association play different roles. They may offer professional development, advocacy, or collective bargaining, but they do not regulate the practice of nursing. Those functions are strictly under the purview of the CNO, which is the regulatory authority for nursing in Ontario.