What political party did William Lyon Mackenzie King belong to?

• A. Conservative Party
• B. New Democratic Party
• C. Liberal Party
• D. Green Party

Answer: (C)

William Lyon Mackenzie King was a leader of the Liberal Party of Canada, and he served as prime minister for many years under that party. He led Canada through much of the interwar period and World War II, making his association with the Liberals a defining part of his political career. The other options either refer to parties that came after his time (New Democratic Party and Green Party) or to a rival party active during his era (Conservative Party). So the Liberal Party is the correct choice because it’s the party he led and represented throughout his time in power.