The correct answer is D. 1 May.
International Workers’ Day (May Day) is a public holiday celebrated on 1 May by many countries around the world. It is a day of celebration for workers and labor movements and a day to commemorate the achievements of the labor movement.
The first May Day was celebrated in 1886 in Chicago, Illinois, United States. The day was chosen because it was the day that the Haymarket Affair took place. The Haymarket Affair was a labor protest that turned violent when police opened fire on a crowd of protesters, killing several people.
The Haymarket Affair led to the death of many workers and the imprisonment of many more. It also led to the rise of the labor movement in the United States.
Today, May Day is celebrated around the world as a day of celebration for workers and labor movements. It is a day to commemorate the achievements of the labor movement and to fight for better working conditions for all workers.
The other options are incorrect because they are not days that are celebrated as International Labour Day.
A. 1 January is New Year’s Day.
B. 21 July is Bastille Day, a national holiday in France.
C. 31 December is New Year’s Eve.