21 November is observed as –

World Vegetarian Day
United Nations Day for South-South Cooperation
World Immunization Day
World Television Day

The correct answer is: A. World Vegetarian Day

World Vegetarian Day is celebrated on November 21 every year. It is a day to promote the vegetarian lifestyle and to raise awareness of the benefits of vegetarianism. Vegetarianism is a diet that excludes meat, fish, and poultry. It can be a healthy and sustainable way of eating, and it can also help to reduce animal suffering.

World Vegetarian Day was first celebrated in 1977 by the North American Vegetarian Society. It is now celebrated by vegetarians around the world. There are many ways to celebrate World Vegetarian Day. You can attend a vegetarian event, cook a vegetarian meal, or simply learn more about vegetarianism.

Here are some of the benefits of vegetarianism:

  • Vegetarianism is a healthy diet. It is low in saturated fat and cholesterol, and it is high in fiber and vitamins.
  • Vegetarianism is a sustainable diet. It requires less land, water, and energy than meat production.
  • Vegetarianism is a compassionate diet. It does not involve the killing of animals.

If you are interested in learning more about vegetarianism, there are many resources available online and in libraries. You can also talk to your doctor or a registered dietitian.