'Madhubani', a style of folk paintings, is popular in which of the following states in India?

Madhubani painting or Mithila painting is a style of Indian painting, practiced in the Mithila region of Bihar state, India and the adjoining parts of Terai in Nepal. Painting is done with fingers, twigs, brushes, nib-pens, and matchsticks, using natural dyes and pigments, and is characterized by eye-catching geometrical patterns. There are paintings for each occasion and festival such as birth, marriage, holi, surya shasti, kali puja, Upanayanam (sacred thread ceremony), and durga puja.

Source: http://en.wikipedia.org/wiki/Madhubani_art