The correct answer is option 2: Survey of India. The Survey of India is responsible for preparing the topographical maps of India. They are the national survey and mapping organization of the country and have been functioning since 1767. The Survey of India is under the Department of Science and Technology and operates under the control of the Ministry of Science and Technology. Their main objective is to provide accurate and reliable geospatial information to support the development and planning activities of the country. They conduct surveys and mapping of different regions of India, including the creation of topographical maps for various purposes such as navigation, land planning, and resource management. Therefore, the Survey of India is the organization responsible for preparing topographical maps in India.