20 October is observed as –

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

20 October is observed as the United Nations Day for South-South Cooperation. It was established in 2005 by the United Nations General Assembly to promote and support South-South cooperation, which is a form of international cooperation between developing countries. South-South cooperation is based on the principles of solidarity, mutual benefit, and respect for national sovereignty. It aims to promote economic and social development, as well as to address common challenges such as poverty, hunger, and climate change.

The other options are incorrect because:

• World Freedom Day is not a recognized international day.
• World Statistics Day is observed on 20 October, but it is not a United Nations day.
• World Hello Day is observed on 21 November.