Final answer:
In Canada, the lieutenant governor of a province typically appoints the registrar for that province, adhering to the protocols of a constitutional monarchy where the queen's representative performs such duties.
Step-by-step explanation:
The registrar is a government official usually responsible for maintaining public records and documents. In Canada, the appointment process for a registrar can vary depending on the specific level and role within the government. However, because the question appears to relate to a provincial appointment, such as in Ontario, the correct answer is generally the lieutenant governor of Ontario. This is because, historically, in Canada's system of government, Lt. Governors as the Queen's representatives in the provinces play a role in the appointment of various officials at the provincial level.