United Nations Day is celebrated every year on which date to mark the UN Charter coming into force?

Introduction / Context:
United Nations Day is an international observance that marks the anniversary of the UN Charter coming into force and the official establishment of the United Nations. It is celebrated every year on 24 October. This date is a cornerstone in general knowledge questions about international organizations, global governance and diplomacy, so aspirants must be able to recall it immediately.

Given Data / Assumptions:
- The observance is clearly stated as United Nations Day.
- It commemorates the coming into force of the UN Charter.
- The options include several dates in October and November that are close together to test accurate recall.

Concept / Approach:
The essential concept is to remember that the UN Charter came into effect on 24 October 1945, and this date later became known as United Nations Day. A good strategy is to group the dates of major international organizations in your memory, such as 24 October for the UN and 10 December for Human Rights Day, and associate each one with its founding event. This context driven memorization is more reliable than rote learning of numbers alone.

Step-by-Step Solution:
Step 1: Focus on the phrase “United Nations Day” and recall its connection to the UN Charter. Step 2: Remember that the Charter came into force and the UN officially came into existence on 24 October 1945. Step 3: Look at the answer options and identify “24 October.” Step 4: Note that 26 October and the November dates are not associated with the founding of the UN. Step 5: Choose 24 October as the correct answer based on this historical link.

Verification / Alternative check:
To verify, think of how 24 October is often marked by UN offices, schools and media outlets with events highlighting the UN's work. Many calendars label 24 October specifically as UN Day. No similar global focus exists on 26 October or the November dates in connection with the founding of the United Nations. This repeated association across sources confirms that 24 October is the correct date.

Why Other Options Are Wrong:
26 October: Not the official date of the UN Charter coming into force and not recognized as United Nations Day.
24 November: Does not correspond to any major founding event of the UN in the common exam syllabus.
26 November: Used for other events in some countries but not for the UN's foundation day.
1 October: Associated with other national and international observances, but not with United Nations Day.

Common Pitfalls:
Students sometimes confuse 24 October with dates related to other organizations or with 10 December, which is Human Rights Day. Another pitfall is assuming that the date must lie in November because many international meetings take place then. To avoid such confusion, explicitly pair “UN Charter in force” with “24 October 1945” in your notes and review this alongside other founding dates for institutions like the IMF and World Bank.

Final Answer:
Correct option: 24 October