Detailed Solution:
The correct answer is “2, 3 and 4”.
1) Goa is now the most urbanised State with 62.2% urban population among states.
2) Coastal urban areas, particularly in states like Maharashtra, Gujarat, and Tamil Nadu, are experiencing rapid urbanization, leading to significant development and construction.
3) The Mumbai-Ahmedabad corridor is witnessing rapid urbanization and industrial growth, potentially creating a large continuous urban area or megalopolis.
4) Many Indian cities face challenges related to slums and pollution.