Answer : 3. "A Surveyor General of India "
Explanation :

Mount Everest, the highest peak in the world, is named after Sir George Everest, a Welsh geographer and surveyor general of India in the 19th century. Although Sir George Everest himself objected to having the mountain named after him, the proposal was accepted, and the mountain retained the name Everest. The naming was done by the Royal Geographical Society in 1865 to honor his contributions to the Great Trigonometrical Survey of India, which played a significant role in mapping the subcontinent.