Explanation:

Correct option 3: Lord Dalhousie

The Governor General of India who started the Postal Service in its modern form was Lord Dalhousie.

Key Contributions:

• Introduced the Indian Postal Service in 1854
• Standardized postage rates
• Established a network of post offices
• Launched the first Indian postage stamp (the Scinde Dawk was earlier, but national system began under him)

Lord Dalhousie’s reforms laid the foundation for a unified and efficient postal system across British India.