How many engines drive ‘PM Gati Shakti’, a project launched by the central government with an aim to revolutionise infrastructure in India?

The correct option is Seven.

Explanation:
PM Gati Shakti - National Master Plan for Multi-modal Connectivity is a transformative initiative launched by the Government of India to revolutionize infrastructure and economic growth. The plan is driven by seven engines of growth:
1. Roads
2. Railways
3. Airports
4. Ports
5. Mass Transport
6. Waterways
7. Logistics Infrastructure

These seven engines are designed to work in unison to pull the economy forward, supported by the complementary roles of Energy Transmission, IT Communication, Bulk Water and Sewerage, and Social Infrastructure to ensure seamless multi-modal connectivity and efficiency.