The correct option is C Kalbelia
The Ramlila is the traditional performance of the story of Ramayana. Sankirtana is the ritual singing, drumming, and dancing of Manipur, while Kalbelia refers to the folksongs and dances of Rajasthan. These are all examples of intangible heritage.
Meanwhile, the three mountain railways of India, viz. the Darjeeling Himalayan Railway, the Nilgiri Mountain Railway, and the Kalka-Shimla Railway, are all part of our tangible heritage.