Labour Day in Canada is celebrated on the:

Discover Canada records this in one direct label. The guide writes: Labour Day First Monday of September. The date the test wants is therefore the first Monday of September.

Labour Day is a moveable Monday holiday. Discover Canada commits Labour Day to a specific moveable date: the first Monday of September. So the calendar date varies year to year (anywhere from September 1 to September 7), but it is always on a Monday — meaning Labour Day always anchors a long weekend. This pattern is shared with several other Canadian holidays observed on Mondays.

A few Canadian holidays follow the Monday pattern. Discover Canada places multiple holidays on Mondays: Victoria Day (Monday preceding May 25 — the Sovereign's birthday), Labour Day (first Monday of September), and Thanksgiving Day (second Monday of October). So the Canadian holiday calendar uses Mondays strategically to create long weekends — an arrangement that supports both family time and economic activity.

Labour Day fits the late-summer transition. Discover Canada places Labour Day in the calendar between Canada Day (July 1) and Thanksgiving Day (second Monday of October). The full Canadian holiday 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), 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 Labour Day marks the late-summer / early-fall transition, traditionally signalling the end of summer holidays and the start of the school year. So when the test asks the date pattern of Labour Day, the source-precise answer is the first Monday of September.

The question is testing whether new citizens know when Labour Day is observed. Discover Canada commits to one timing: the first Monday of September. The right test answer matches that.

The wrong answer choices each substitute a different timing. "Last Monday of August" is too early — Labour Day comes in September. "Second Monday of October" is Thanksgiving Day, not Labour Day. "First Monday of October" is also too late — Labour Day is in September, not October. Only the first-Monday-of-September answer matches.