The Bharatmala Pariyojana is a flagship project related to the development of roads and highways in India. It aims to construct a network of National Highways throughout the country.

Option 1, which suggests the interlinking of Northern and Southern Indian rivers in a garland shape, is not correct. This concept is actually related to a different project called the Interlinking of Rivers (ILR) project which aims to transfer water from surplus river basins to water-deficit river basins.

Option 3, which suggests the interlinking of all cities of India through railways, is also not correct. Although there have been discussions about connecting various cities through railway networks, this is not the objective of the Bharatmala Pariyojana.

Option 4, which suggests the interlinking of all industrial regions of India through pipelines, is also not correct. This concept is related to a different project called the National Gas Grid or Urja Ganga, which aims to connect gas sources and major industrial areas through a pipeline network.

In conclusion, the correct answer is option 2, which states that the Bharatmala Pariyojana is related to the development of National Highways in India.