A festival celebrated in Mizoram showcasing traditional dances and music is:

The correct answer is: b) Chapchar Kut.

Chapchar Kut is a traditional Mizo festival celebrated in the month of January or February. It is a harvest festival that marks the end of the agricultural season. The festival is celebrated with great pomp and show, and features a variety of traditional dances and music.

The other options are incorrect because:

• Mim Kut is a festival celebrated by the Chakma people of Mizoram. It is a harvest festival that marks the end of the rice-transplanting season.
• Thalfavang Kut is a festival celebrated by the Pawi people of Mizoram. It is a harvest festival that marks the end of the jhum cultivation season.
• Pawl Kut is a festival celebrated by the Hmar people of Mizoram. It is a harvest festival that marks the end of the maize-harvesting season.