The Agenda - 21 Report of the Rio Conference was published in _____.

1993

The correct answer is Option (4) → 1993

The Agenda 21 Report is a document that was published in 1993 following the Earth Summit, officially known as the United Nations Conference on Environment and Development (UNCED), held in Rio de Janeiro, Brazil, in 1992. It is often referred to simply as "Agenda 21." The Agenda 21 Report outlined a wide range of goals, strategies, and actions to promote sustainable development.