Answer- B
The app "Call Before You Dig" was launched by Prime Minister Modi with the aim of preventing unplanned excavation activities that can lead to harm to subterranean utility infrastructure like optical fibre cables.
In a collaborative effort between the Department of Telecommunications and the Bhaskaracharya Institute for Space Applications and Geoinformatics, an app has been created to safeguard India's subterranean public infrastructure.
The primary objective of the app is to prevent harm to this infrastructure. The Bhaskaracharya Institute for Space Applications and Geoinformatics operates under the Government of Gujarat.