Sentence A — "If India has embarked on the liberalization route, she cannot afford to go back." — This is a conclusion drawn from the assumed fact that India is liberalizing. It is not directly observed but deduced, so it is an Inference (I).
Sentence B — "Under these circumstances, being an active supporter of WTO policies will be a good idea." — This is an opinion or recommendation, which qualifies as a Judgement (J).
Sentence C — "The WTO is a truly global organization aiming at freer trade." — This is descriptive and relates to an actual attribute of WTO, so it is a Fact (F).
Sentence D — "Many member countries have already drafted plans to simplify tariff structures." — This is a verifiable statement about existing actions, so it is also a Fact (F).
Thus, the classification is: I (A), J (B), F (C), F (D) → IFJF.