Dalhousie is hailed as the maker of modern India because of his implementation of various reforms that had a significant impact on the country. Option 1, educational reforms, was one of the initiatives undertaken by Dalhousie to revamp the education system in India. He introduced English as the medium of instruction, established universities, and promoted modern education.

Option 2, the construction of railways and the introduction of telegraph and postal services, was another crucial reform by Dalhousie. These developments improved communication and transportation, connecting different parts of the country and facilitating trade and administration.

Option 3, the establishment of a public works department, was also an endeavor of Dalhousie. This department focused on improving infrastructure like roads, bridges, and canals, which were vital for the development and integration of India.

Alert - Correct answer should be 4: Factories Act to improve the condition of Indian labour. The Factories Act was actually passed in 1881, well after Dalhousie`s tenure as Governor-General, so he could not have initiated this particular reform. However, it is worth noting that Dalhousie did prioritize the improvement of working conditions, health, and sanitation in India through other measures.