The traditional folk dance form from the Mithila region of Bihar is:

The correct answer is Jhumar.

Jhumar is a folk dance form from the Mithila region of Bihar. It is a vigorous dance that is performed in a circle, with the dancers holding hands and moving their bodies in a rhythmic fashion. The dance is often accompanied by music from drums and other instruments.

Jhumar is a popular dance form that is performed at weddings, festivals, and other social gatherings. It is a lively and energetic dance that is enjoyed by people of all ages.

Here is a brief description of each of the other options:

• Kathak is a classical Indian dance form that originated in the northern Indian state of Uttar Pradesh. It is a graceful and sophisticated dance that is characterized by its intricate footwork and hand gestures.
• Bihu is a folk dance form from the northeastern Indian states of Assam, Meghalaya, and Arunachal Pradesh. It is a lively and energetic dance that is performed during the Bihu festival, which is celebrated in the months of January and February.
• Garba is a folk dance form from the Indian state of Gujarat. It is a popular dance form that is performed during the Navratri festival, which is celebrated in the months of September and October.