ILLUSIVE means-

✅ কেন সঠিক: ‘Illusive’ means based on illusion, unreal or deceptive. Among these options, ‘not certain’ (not real or reliable) is the nearest meaning, and both books accept it.

❌ অন্য অপশন: ‘Not deceptive’ is the opposite; ‘not obvious’ and ‘not coherent’ do not describe something unreal.

💡 মনে রাখুন: illusive / illusory = unreal, deceptive; elusive = hard to catch or remember. Be careful with this pair.

📌 জেনে রাখুন: The option list has no exact synonym (such as ‘deceptive’ or ‘unreal’), so the question is excluded from model tests.