World Hello Day, which promotes personal communication to preserve peace, is observed on which date each year?

Introduction / Context:
World Hello Day is a unique observance that encourages people to greet at least ten others in a spirit of peace and friendship. The idea is to use simple personal communication as a way to resolve conflicts and reduce tensions. Although lighter in tone than some other observances, it is often included in lists of important days for competitive exams, particularly in general awareness and social studies sections.

Given Data / Assumptions:

• The question asks for the date of World Hello Day.
• It mentions that the day is associated with peace through communication.
• All four options are consecutive dates in November.
• We assume the candidate has revised important international days for November, including this one.

Concept / Approach:
World Hello Day is observed on 21 November every year. It began in the nineteen seventies as a response to conflict and has since grown into a global event observed in many countries. The conceptual approach is to link 21 November with both World Hello Day and World Television Day, which often appear together in exam tables, and to remember that these days fall in the third week of November.

Step-by-Step Solution:
Step 1: Identify that the observance in question is World Hello Day. Step 2: Recall that this day encourages people to say hello to others as a symbol of peaceful communication. Step 3: Remember from GK notes that the date for World Hello Day is 21 November. Step 4: Compare this recalled date with the four closely spaced November dates listed in the options. Step 5: Select option A, 21 November, since it matches the established date of World Hello Day.

Verification / Alternative check:
Verification can be done by looking at important days lists in competitive exam guides or on educational websites that cover international observances. These sources usually place World Hello Day on 21 November, often right before or near World Television Day. Some international news outlets and cultural organisations also mark this day with simple campaigns encouraging greetings and dialogue. Seeing 21 November repeatedly associated with World Hello Day in such material confirms the correct date.

Why Other Options Are Wrong:
Option B, 20 November, is not the designated date for World Hello Day in standard reference lists.
Option C, 22 November, is close but does not match the historically observed date and is present only as a distractor.
Option D, 23 November, also does not correspond to World Hello Day and should not be chosen.

Common Pitfalls:
Because several observances fall in November, candidates sometimes confuse their dates, especially when the options are consecutive numbers such as 20, 21, 22, and 23 November. Another pitfall is giving less importance to lighter observances like World Hello Day compared to more serious topics, which leads to weaker recall. To avoid mistakes, students should revise all listed days for each month, regardless of how serious or light the underlying theme may appear.

Final Answer:
World Hello Day is observed each year on 21 November.