Which of the following folk dances is performed to celebrate a good harvest and is popular in the states of Odisha and Chhattisgarh?

The correct option is Karma.

Explanation:
The Karma dance (also known as Karma Naach) is a traditional folk dance performed in Central and Eastern India, primarily popular in the states of Odisha, Chhattisgarh, Jharkhand, Madhya Pradesh, and Bihar.
This dance is performed during the autumn festival of Karma Puja, which worships the Karma tree (symbolizing fate, fortune, and fertility). It is celebrated by tribal communities (such as the Gond, Baiga, Oraon, and Binjhal) to mark the end of the sowing season, pray for a good harvest, and celebrate prosperity.

Let's look at the other options to understand why they are incorrect:
- Bhangra: A highly energetic folk dance originating from the Punjab region, traditionally performed during the Vaisakhi festival to celebrate the harvest.
- Garba: A popular community folk dance originating from the state of Gujarat, performed during the nine-day Hindu festival of Navratri.
- Rouf: A traditional folk dance performed by the women of Jammu and Kashmir, especially during the spring season and festivals like Eid.