the blank is somone appointed by the monarch King or queen to act in his/ her place in Canada prime minister, governer general, assistant to governor, or house of commons

The correct answer is "Governor General." The Governor General is the representative of the monarch in Canada and acts on behalf of the King or Queen. They perform various ceremonial, constitutional, and symbolic duties, including giving royal assent to legislation, summoning and dissolving Parliament, and appointing the Prime Minister. The Prime Minister is the head of government, elected by the House of Commons, and responsible for leading the executive branch.

The blank in the given statement is the "Governor General."

To determine the answer, let's break down the options:

1. Prime Minister: The Prime Minister is not appointed by the monarch to act in their place. The Prime Minister is the head of government and is elected by the members of Parliament.

2. Governor General: The Governor General is an official who represents the monarch (King or Queen) at the federal level in Canada. The Governor General is appointed by the monarch and acts as their representative, performing ceremonial duties and exercising some constitutional powers.

3. Assistant to Governor: This option is not accurate in the context provided. There is no specific role as the "Assistant to Governor" in relation to the monarch's appointment.

4. House of Commons: The House of Commons is one of the two houses of the Canadian Parliament but does not directly relate to the individual appointed by the monarch.

Considering the options and their respective roles, the correct answer is the "Governor General."

The person appointed by the monarch to act in their place in Canada is the Governor General.