8th March is observed as

Concept

Several days on the international calendar are dedicated to a specific cause, and each is fixed to a particular date by the United Nations or another global body. To answer such a question you must match the exact date to the cause it commemorates, not just to a roughly related theme.

Application

8 March is observed every year as International Women's Day. It is a United Nations-recognised day that celebrates the social, economic, cultural and political achievements of women and calls for accelerating gender equality. The date traces back to early-20th-century women's labour movements and was formally recognised by the UN in 1977.

Cross-check (the other dates)

• World Environment Day is held on 5 June.

• World Food Day is held on 16 October.

• World Literacy Day (International Literacy Day) is held on 8 September.

Since 8 March maps uniquely to the women's-rights observance, the correct answer is International Women's Day.