The correct answer is option 3, Lord Dalhousie. Lord Dalhousie was the Governor-General of India from 1848 to 1856, during the British colonial rule. He played a significant role in modernizing various aspects of India, and one of his major contributions was the establishment of the modern postal service in the country. Under his leadership, the postal service was introduced in India in 1854. This service aimed to improve communication and facilitate the efficient transmission of letters and parcels across different regions of the country. The introduction of the postal service by Lord Dalhousie had a significant impact on the communication infrastructure of India and played a vital role in connecting people and businesses across the vast subcontinent.