This contemporary question flies into a

Solution

The sentence talks about how this contemporary question surfaces into a longstanding discussion among scholars and policymakers about nation-building and nationalism: can countries maintain long- term stability and unity while containing so many ethnic and religious identities. FLIES is inapt here; TIES means to form part of, and would be more apt here. EPILOGUE means a final comment or conclusion after a book; DIALOGUE means discussion and would be more appropriate here. COHERENCE means the act of speaking or writing concisely and clearly; COHESION (unity) would be more apt. PROCEEDING means following; POSSESSING (containing; owning) would be more apt. Since all 4 words are inapt, (e) is the right answer.