Explanation:

India's Northeast region is renowned for its vibrant cultural festivals, which showcase the rich traditions of its indigenous communities. * **Correct Option (A) Nagaland:** The Hornbill Festival is a grand annual cultural festival celebrated in the state of Nagaland, India. It is held every year from December 1st to December 10th at Kisama Heritage Village, near Kohima. The festival is a spectacular display of the diverse cultural heritage, traditions, and customs of the various Naga tribes, featuring traditional dances, music, crafts, food, and indigenous sports. It is named after the Indian hornbill, a bird revered by the Nagas, and is often referred to as the 'Festival of Festivals'. * **Incorrect Option (B) Sikkim:** Sikkim celebrates its own unique festivals such as Losar (Tibetan New Year), Saga Dawa, and Pang Lhabsol, which are distinct from the Hornbill Festival. * **Incorrect Option (C) Meghalaya:** Meghalaya is known for festivals like Wangala (Garo tribe's harvest festival) and Nongkrem Dance (Khasi tribe's thanksgiving festival), but the Hornbill Festival is not celebrated there. * **Incorrect Option (D) Goa:** Goa is famous for its distinct cultural events like the Goa Carnival, Shigmo (a spring festival), and various music festivals, none of which are the Hornbill Festival.