Which of the following topics is NOT appropriate to teach through discussion…

The discussion method is a learner-centred technique best suited to content that invites multiple viewpoints, value judgements, or debate - topics where learners can reason and exchange opinions through dialogue. It is not the right method for content that consists of fixed, verifiable facts, which are better taught through lecture, demonstration, or direct explanation.

Among the four topics, three are inherently opinion- or policy-oriented and admit differing viewpoints: a country's foreign policy involves debatable strategic choices, everyday social life in a modern nation draws on varied lived experiences, and the UN's peace-keeping role is a contested subject of international relations. The Solar System, in contrast, is a body of established astronomical facts (planetary order, orbital mechanics, physical properties) with a single verified description - there is no legitimate difference of opinion to discuss.

• Foreign Policy of India - a policy topic that invites debate over strategic choices, so it fits the discussion method.

• Living in modern India - a social topic drawing on varied lived experience and opinion, so it fits the discussion method.

• UNO and World Peace - a contested international-relations topic with room for differing views, so it fits the discussion method.

• Solar System - consists of settled scientific facts with no legitimate difference of opinion, so it does NOT fit the discussion method; direct explanation or demonstration suits it better.

Applying the general principle that fact-based, descriptive scientific content is better taught through lecture or demonstration than through open-ended discussion confirms the Solar System as the one topic for which the discussion method is not appropriate.