The correct option is A Tunnels - 12
Konkan Railway started in 1998. There are 12 tunnels on this track. The 6.5 km tunnel at Karbude is the longest. There are 179 big and 1819 small bridges on this track. Out of these, the 2065.8 m long bridge on River Sharavati near Honnawar is the biggest. The 64 m tall bridge on the river Panval near Ratnagiri is India’s tallest bridge.