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The correct answer is option 2: Kalka-Shimla Railway.
The Kalka-Shimla Railway, a 96.6 km long, single track working rail link built in the mid-19th century to provide a service to the highland town of Shimla, is emblematic of the technical and material efforts to disenclave mountain populations through the railway. It`s recognised by UNESCO for its importance in terms of colonial-era engineering and as an exceptional example of the interchange of values on developments in technology.
Option 1, Dilwara Temple is a well-known temple complex not included in the UNESCO’s World Heritage list. Option 3, Bhitarkanika Mangrove Area, is a significant biodiversity hotspot but it is not currently a World Heritage site. Option 4, Vishakhapatnam to Araku valley railway line, is a popular tourist attraction for its scenic beauty, but it is also not on the UNESCO’s World Heritage list.