Vimy Day is celebrated on:

Discover Canada records this in one direct label. The guide writes: Vimy Day April 9. The date the test wants is therefore April 9.

The date commemorates a specific battle. Discover Canada writes: "The Vimy Memorial in France honours those who served and died in the Battle of Vimy Ridge on April 9, 1917, the first British victory of the First World War." So Vimy Day is April 9 — the anniversary of the 1917 Canadian-led victory at Vimy Ridge during the First World War.

Vimy Ridge was a defining Canadian moment. Discover Canada commits the Battle of Vimy Ridge to specific historical significance: April 9, 1917, and the first British victory of the First World War. So the battle was both Canadian (the four divisions of the Canadian Corps fought together for the first time at Vimy) and British (in the imperial-military sense — Canadian troops were part of the British Empire forces). The victory was the first of the war for the British side.

Vimy Day sits in the Canadian holiday calendar. Discover Canada places Vimy Day (April 9) between Easter Monday and Victoria Day in the holiday order. The full Canadian holiday calendar includes: New Year's Day (January 1); Sir John A. Macdonald Day (January 11); Good Friday; Easter Monday; Vimy Day (April 9); Victoria Day (Monday preceding May 25); Fête nationale Quebec (June 24); Canada Day (July 1); Labour Day; Thanksgiving Day; Remembrance Day (November 11); Sir Wilfrid Laurier Day (November 20); Christmas Day (December 25); Boxing Day (December 26). So Vimy Day is one of two named war-related days in the Canadian calendar — alongside Remembrance Day on November 11. The Vimy Memorial in France honours those who served and died at Vimy Ridge — a permanent commemoration that the April 9 date keeps alive in Canadian memory. So when the test asks the date of Vimy Day, the source-precise answer is April 9.

The question is testing whether new citizens know the date of Vimy Day. Discover Canada commits to one date: April 9. The right test answer matches that.

The wrong answer choices each pick a different date. "November 11" is Remembrance Day — also a war-commemoration day, but for armistice (1918), not Vimy Ridge (1917). "July 1" is Canada Day. "May 25" relates to Victoria Day (the Monday preceding May 25 — the Sovereign's birthday), not Vimy Day. Only April 9 — the date the source explicitly names — matches.