The correct answer is D. Chhath Puja.
Chhath Puja is a four-day Hindu festival that is primarily observed in the Indian states of Bihar, Jharkhand, Uttar Pradesh, and eastern Uttarakhand. It is also observed by the Bihari diaspora in other parts of India, as well as in Nepal, Mauritius, Guyana, Trinidad and Tobago, Suriname, and the United Kingdom.
The festival is dedicated to the Sun god, Surya, and his consort, Usha. It is a thanksgiving festival for the Sun god for providing light and life to the universe. It is also a prayer for good health, prosperity, and happiness for the family.
The festival begins on the sixth day of the Hindu month of Kartik (November-December) and ends on the eighth day. The first day of the festival is called Nahay Khay, when people take a holy bath in the river and eat a special meal. The second day is called Kharna, when people fast and offer prayers to the Sun god. The third day is called Sandhya Arghya, when people offer prayers to the Sun god at sunrise and sunset. The fourth day is called Usha Arghya, when people offer prayers to the Sun god at sunrise.
Chhath Puja is a very important festival for the people of Bihar. It is a time for family and friends to come together and celebrate the Sun god. It is also a time to pray for good health, prosperity, and happiness for the family.
The other options are not unique to Bihar. Deepavali is a Hindu festival of lights that is celebrated all over India. Bisu is a tribal festival that is celebrated in the states of Jharkhand and Odisha. Vinayak Chaturthi is a Hindu festival that is celebrated in honor of the god Ganesha.