Kati Bihu is a festival celebrated in Assam, which is the correct answer (option A). Let's delve into the details of this festival.

Kati Bihu: A Festival of Assam
Kati Bihu, also known as Kangali Bihu or the Festival of Poor, is an important cultural festival celebrated in the Indian state of Assam. It is primarily observed by the farming community and is associated with agriculture and the cultivation of crops. Kati Bihu is celebrated in the month of October when the fields are usually devoid of crops, signifying a period of scarcity.

Significance and Observance
Kati Bihu marks the culmination of the sowing season and the beginning of the plant growth stage. It is a time when farmers pray for a good harvest and seek blessings for their crops. The festival is observed with great enthusiasm and is an integral part of Assamese culture.

Celebrations and Rituals
During Kati Bihu, people light earthen lamps called 'saki' near the tulsi plant, paddy fields, and in various parts of their homes. These lamps are believed to guide the spirits of ancestors and provide them with warmth and light. Additionally, people also light bonfires called 'Meji' in open spaces. The bonfires are made using bamboo, dried leaves, and other combustible materials.

Bihu Songs and Dance
One of the highlights of Kati Bihu is the performance of Bihu dance and the singing of traditional Bihu songs. Bihu is a vibrant folk dance form of Assam, characterized by energetic movements and rhythmic footwork. The dancers, usually dressed in traditional Assamese attire, perform to the beats of the dhol, pepa (a buffalo hornpipe instrument), and taal (a percussion instrument). The Bihu songs are sung in the Assamese language and depict various aspects of rural life, love, and nature.

Conclusion
In conclusion, Kati Bihu is a significant festival celebrated in the state of Assam. It holds immense cultural and agricultural importance for the people of Assam, particularly the farming community. The festival is marked by the lighting of lamps, bonfires, Bihu dance performances, and the singing of traditional Bihu songs. It showcases the rich cultural heritage of Assam and reinforces the bond between the people and the land they cultivate.