Who was appointed as the Surveyor-General of India from 1815 to 1821?

The correct answer is Option (1) → Colin Mackenzie

Colin Mackenzie (born 1754) was an engineer, surveyor and cartographer. In 1815 he was appointed the first Surveyor General of India, a post he held till his death in 1821. He collected local histories and surveyed historic sites, and it was his work that brought the ruins at Hampi to light in 1800.