The correct answer is Option 2: 1 and 2.

Here`s the reasoning behind it:

1. Chapchar Kut festival - Mizoram:

Chapchar Kut is a traditional festival celebrated by the Mizos, an ethnic community residing in the state of Mizoram, India. The festival is usually held in the month of March after the completion of the Jhum cultivation. During the festival, the Mizos perform traditional dances, songs, and music. The festival is a way to express gratitude to the Almighty for a bountiful harvest. The Mizoram government has also declared the festival as a state holiday.

2. Khongjom Parba ballad - Manipur:

Khongjom Parba is a ballad that describes the battle of Khongjom, which was fought between the Manipuri army and the British army in 1891. The ballad is a popular part of Manipuri culture and is usually recited during important occasions. The battle of Khongjom is an important event in Manipuri history as it marked the end of the Manipuri independence movement.

3. Thang-Ta dance - Sikkim:

Thang-Ta is a traditional martial art form that originated in Manipur and is now also popular in the neighboring state of Sikkim. The dance form involves the use of swords and spears and is usually performed during important events and festivals. Thang-Ta is not unique to Sikkim, but it is widely practiced in the state and has become an important part of Sikkimese culture.

So, the correct answer is option 2 (1 and 2) as both Chapchar Kut festival and Khongjom Parba ballad are associated with Mizoram and Manipur respectively.