Final answer:
The Financial Services Regulatory Authority of Ontario regulates Mortgage Broker, Agent, and Administrator activity in the province of Ontario.
Step-by-step explanation:
The governing body that regulates Mortgage Broker, Agent and Administrator activity in the province of Ontario is the Financial Services Regulatory Authority of Ontario (FSRA). This body is responsible for the oversight of various financial institutions and professionals that conduct business within the province, ensuring they comply with existing laws and regulations.
Entities like the Financial Services Tribunal, Ontario Securities Commission, and Ontario Financing Authority have different areas of responsibility. The FSRA, in particular, aims to provide protection to consumers and maintain public trust in Ontario's financial services industries.