Final answer:
The title 'Dominion of Canada' was officially used from 1867 until the Canada Act of 1982 when it was effectively phased out, so the correct answer is C) Until 1982.
Step-by-step explanation:
The title 'Dominion of Canada' was officially used from the country's founding in 1867, when the British North America Act came into effect, creating the Dominion by joining Nova Scotia, New Brunswick, and the Province of Canada (which included Ontario and Quebec).
This event marked the beginning of Canada as a self-governing entity within the British Empire. The term 'Dominion' was used less frequently over time as Canada's autonomy increased. Though it was not officially removed from government documents until the passing of the Canada Act in 1982, its use declined significantly after the Statute of Westminster in 1931, which granted Canada and other dominions full legal autonomy.
Thus, the correct answer is C) Until 1982, when the title was effectively phased out with the Canada Act which patriated the Canadian Constitution.