How is the Canadian prime minister selected?

In short the Canadians vote for who their prime minister will be.

Explanation:

Using the plurality voting system, Canadians vote for their local Member of Parliament (MP), who represents one specific constituency in the House of Commons. Generally, the leader of the party with the most seats in the House of Commons becomes the prime minister.

The prime minister is the head of the Canadian government and ruler of Canada. A person becomes prime minister by being leader of the political party that wins the most House of Commons seats in a Canadian federal election.              

Person becomes prime minister by being leader of the political party that wins the most House of commons seats in the Canadian federal election.

Explanation:

answer; extroversion;