‘Agenda 21’ was a set of practices recommended at the_______ .

Correct option is A

The correct answer is (a) Rio Summit, 1992.
· Agenda 21 is a comprehensive action plan developed and recommended at the Rio Earth Summit held in 1992 (formally known as the United Nations Conference on Environment and Development - UNCED).
· It is a global blueprint aimed at promoting sustainable development worldwide and addresses various issues, including combating poverty, environmental protection, and promoting sustainable agricultural practices.
· The number "21" refers to the 21st century, indicating that the agenda's objectives were meant to guide global development into the 21st century.
· The Rio Summit, also called the Earth Summit, took place in Rio de Janeiro, Brazil, and was a landmark event where global leaders came together to discuss and implement sustainable development strategies. Agenda 21 remains a crucial document in international environmental and development policies.