Subject interlinking is advantageous in answering optional paper questions at UPSC as it enhances critical thinking and comprehensive understanding. By drawing connections between different subjects, such as politics, economics, and sociology, candidates can provide richer, more nuanced answers. This approach also aids in constructing multi-dimensional arguments, demonstrating a holistic grasp of the syllabus. Interlinking concepts enables aspirants to synthesize information effectively, allowing for clear articulation of ideas that can impress examiners and strengthen overall performance.