The correct answer is (c) Lord Dalhousie.
Lord Dalhousie was the Governor-General of India from 1848 to 1856. He was a strong advocate of modernization and technological progress in India. In 1853, he sanctioned the construction of the first electric telegraph line in India, which connected Calcutta to Diamond Harbour. This line was later extended to other parts of the country, and it played a vital role in the development of India’s infrastructure.
Lord Canning was the Governor-General of India from 1856 to 1862. He was not involved in the construction of the first electric telegraph line in India.
William Bentinck was the Governor-General of India from 1828 to 1835. He was also not involved in the construction of the first electric telegraph line in India.
None of the above options is correct.