Correct option is D
Ans. (d) Colin Mackenzie
- The Surveyor General of India heads the Survey of India, responsible for mapping and surveying.
- Mackenzie collected important manuscripts, maps, and inscriptions during his work.
- The Survey of India was officially established in 1767.
- The Great Trigonometrical Survey (GTS), initiated later, contributed to mapping India accurately.
- The office of Surveyor General continues today, aiding national development.