Which Canadian Prime Minister served from 1968 to 1979 and again from 1980 to 1984?

• A. Lester B. Pearson
• B. John Diefenbaker
• C. Pierre Trudeau
• D. Brian Mulroney

Answer: (C)

The correct answer is Pierre Trudeau, who served as Prime Minister of Canada from 1968 to 1979 and then again from 1980 to 1984. His time in office is notable for major social changes, including the implementation of the Official Languages Act, the introduction of the Canadian Charter of Rights and Freedoms, and significant advancements in social policies.

Trudeau's leadership was characterized by his charismatic style and his vision of a "Just Society," emphasizing individual rights and the role of the government in addressing social issues. His government also had a profound impact on Canada's constitutional framework, particularly with the patriation of the Constitution in 1982, which included the Charter.

The other figures mentioned had their own significance in Canadian history: Lester B. Pearson was Prime Minister prior to Trudeau and is best known for his role in establishing universal health care and the Canada Pension Plan; John Diefenbaker served in the late 1950s and early 1960s and was notable for his focus on civil rights and indigenous affairs; Brian Mulroney, who came after Trudeau, is remembered for his economic policies and the Canada-U.S. Free Trade Agreement. However, none of them served during the specific periods indicated in the question,