9 November is observed as –

The correct answer is: B. United Nations Day for South-South Cooperation

9 November is observed as the United Nations Day for South-South Cooperation. It was established by the United Nations General Assembly in 2005 to promote and support South-South cooperation, which is a form of international cooperation between developing countries. South-South cooperation can take many forms, such as the exchange of knowledge, technology, and resources, as well as the provision of technical assistance and training. It is seen as a way to promote economic development and social progress in developing countries.

The other options are incorrect.

• World Freedom Day is not a recognized international day.
• Labour Day is celebrated on different dates in different countries. In some countries, it is celebrated on 1 May, while in others it is celebrated on a different date.
• World Alzheimer’s Day is observed on 21 September.