HomeUPSCThe busiest inland water-way of Europe is the Rhine. Its preeminence as a waterway rests on the fact that 639. The busiest inland water-way of Europe is the Rhine. Its preeminence as a waterway rests on the fact thatBy Admin / October 4, 2025 A. it flows through the most industrialised part of Europe B. it follows a rift valley C. its course is never frozen D. it falls in the North Sea ✅ The correct answer is option C.