The Peace Tower on Parliament Hill was completed in 1927 in memory of:

Discover Canada records this in one direct sentence about the Parliament Buildings. The guide writes: The Peace Tower was completed in 1927 in memory of the First World War. The Memorial Chamber within the Tower contains the Books of Remembrance in which are written the names of soldiers, sailors and airmen who died serving Canada in wars or while on duty. The dedication the test wants is therefore soldiers who died in the First World War.

Two precise commitments. Discover Canada commits the Peace Tower to TWO specific facts: (1) completed in 1927, and (2) in memory of the First World War. So the year and the dedication are both unambiguous. The Tower stands above the Centre Block of the Parliament Buildings on Parliament Hill in Ottawa as the country's central war memorial.

The Memorial Chamber holds the Books of Remembrance. Discover Canada commits the Tower's interior to a specific feature: the Memorial Chamber, which holds the Books of Remembrance. The Books of Remembrance contain the names of "soldiers, sailors and airmen who died serving Canada in wars or while on duty." So the Tower honours not only First World War dead but, through the Books of Remembrance kept inside, all Canadian war dead and on-duty deaths. Each fallen Canadian's name is recorded — a national record of sacrifice.

The Tower replaced a fire-damaged structure. Discover Canada writes that "the Centre Block was destroyed by an accidental fire in 1916 and rebuilt in 1922. The Library is the only part of the original building remaining. The Peace Tower was completed in 1927 in memory of the First World War." So the construction sequence runs: 1860s (original Parliament Buildings completed); 1916 (Centre Block destroyed by fire); 1922 (Centre Block rebuilt); 1927 (Peace Tower completed). The Library survived the fire and is the only remaining piece of the original 1860s building. The Peace Tower's 1927 completion came less than a decade after the end of the First World War (1918) — making the dedication a fresh and direct memorial to the war dead. So when the test asks who the Peace Tower commemorates, the source-precise answer is the soldiers — and sailors and airmen — who died in the First World War, with the broader memorial honour extending through the Books of Remembrance to all Canadians who died serving in wars or on duty.

The question is testing whether new citizens know the dedication of the Peace Tower. Discover Canada commits to one dedication: in memory of the First World War. The right test answer matches that.

The wrong answer choices each substitute a different commemoration. The first choice names the figures of 1867 Confederation but is not the Peace Tower's named dedication. The third choice names the monarch under whom the original 1860s buildings were completed — but the Peace Tower itself is dedicated to the First World War, not to the monarch. The fourth choice describes a different national achievement. Only the First-World-War dedication — the source's exact named purpose — matches.