The correct answer is option 4: 1, 2, and 3.

Let`s break down each option to understand why they are considered India`s green initiatives:

1. National Green Highways Mission: This initiative aims to promote the greening of national highways in India. It focuses on planting trees and adopting environmentally friendly practices along the highways to reduce pollution and enhance the ecological balance.

2. R&D for Clean Coal Technologies: This initiative involves research and development efforts to find cleaner and more sustainable alternatives to coal-based energy generation. It aims to reduce the environmental impact of coal-based power plants by developing technologies that capture and utilize carbon dioxide emissions.

3. National Green Corridor Programme: This initiative focuses on creating green corridors for the transportation of perishable goods. It ensures that transportation vehicles are energy-efficient and use environmentally friendly fuels. The program also promotes the use of renewable energy sources for cold storage facilities and warehouses along the transport route.

Therefore, all three options — National Green Highways Mission, R&D for Clean Coal Technologies, and National Green Corridor Programme — are considered as India`s green initiatives.