December 19 is observed as –

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

December 19 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 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:

• Global Family Day is observed on May 15.
• World Telecommunication Day is observed on May 17.
• International Human Solidarity Day is observed on December 20.