The correct answer is C. Sohrai.
Sohrai is a harvest festival celebrated by the Santhal people of Jharkhand. It is a time to celebrate the end of the harvest season and to give thanks to the gods for their blessings. The festival is marked by feasting, dancing, and singing.
Shivratri is a Hindu festival that celebrates the marriage of the god Shiva and the goddess Parvati. It is observed on the 14th night of the dark half of the month of Phalguna (February-March).
Janmashtami is a Hindu festival that celebrates the birth of the god Krishna. It is observed on the 8th day of the dark half of the month of Bhadrapada (August-September).
Pongal is a four-day harvest festival celebrated by the Tamil people of India. It is observed from the 14th to the 17th of January.