To answer this question, you need to be familiar with the geography of India. Let's go through each option to understand why it is correct or incorrect:
Option A) Nagercoil - This option is incorrect because Nagercoil is a city located in the Kanyakumari district of Tamil Nadu, but it is not the southernmost tip of the mainland of India.
Option B) Port Blair - This option is incorrect because Port Blair is the capital city of the Andaman and Nicobar Islands, which is a group of islands located in the Bay of Bengal. It is not part of the mainland of India.
Option C) Tuticorin - This option is incorrect because Tuticorin, also known as Thoothukudi, is a city located in the Thoothukudi district of Tamil Nadu. It is not the southernmost tip of the mainland of India.
Option D) Kanyakumari - This option is correct because Kanyakumari is the southernmost tip of the mainland of India. It is located in the Kanyakumari district of Tamil Nadu and is a popular tourist destination known for its beautiful beaches and the meeting point of the Arabian Sea, the Bay of Bengal, and the Indian Ocean.
The correct answer is D. Kanyakumari. This option is correct because it is the southernmost tip of the mainland of India.