Boxing Day is celebrated on:

Discover Canada records this in one direct label. The guide writes: Boxing Day December 26. The date the test wants is therefore December 26.

The date is fixed. Discover Canada commits Boxing Day to a single calendar date — December 26 — meaning the holiday is on the day immediately after Christmas Day every year. Like Christmas Day (December 25) and New Year's Day (January 1), Boxing Day is a fixed-date Canadian holiday — not moveable like Easter.

Boxing Day is paired with Christmas Day. Discover Canada places Boxing Day next to Christmas Day — December 25 in the Canadian holiday calendar. So the December 25–26 pair forms a back-to-back two-day Canadian holiday window — Christmas Day on the 25th and Boxing Day on the 26th. The two days together close out the Canadian holiday year.

Boxing Day closes the Canadian holiday calendar. Discover Canada places Boxing Day as the LAST entry in its National Public Holidays list. The full Canadian calendar runs from New Year's Day (January 1), Sir John A. Macdonald Day (January 11), Good Friday and Easter Monday in spring, Vimy Day (April 9), Victoria Day (Monday preceding May 25 — the Sovereign's birthday), Fête nationale Quebec (June 24, Feast of St. John the Baptist), Canada Day (July 1), Labour Day (first Monday of September), Thanksgiving Day (second Monday of October), Remembrance Day (November 11), Sir Wilfrid Laurier Day (November 20), Christmas Day (December 25), and Boxing Day (December 26). So Boxing Day on the 26th is the final public holiday of the Canadian year. The Canadian holiday calendar then begins again with New Year's Day on January 1. So when the test asks the date of Boxing Day, the source-precise answer is December 26.

The question is testing whether new citizens know the date of Boxing Day. Discover Canada commits to one date: December 26. The right test answer matches that.

The wrong answer choices each pick a different date. The first option is the day before Christmas, not Boxing Day. "December 25" is Christmas Day. "January 1" is New Year's Day. Only December 26 — the date the source explicitly names for Boxing Day — matches.