The correct answer is A. Onam.
Onam is a 10-day festival celebrated in the Indian state of Kerala. It is the most important festival of the Malayali people and is a time for family reunions and feasting. One of the special features of Onam is the boat races that are held on the final day of the festival. The races are a popular attraction and attract people from all over the world.
B. Rongali Bihu is a harvest festival celebrated by the Assamese people. It is a time for thanksgiving and for celebrating the arrival of spring. The festival is marked by feasting, dancing, and singing. Boat races are not a special feature of Rongali Bihu.
C. Navratri is a nine-day festival celebrated by Hindus all over India. It is a time for devotion to the goddess Durga. The festival is marked by prayers, fasting, and feasting. Boat races are not a special feature of Navratri.
D. Pongal is a four-day harvest festival celebrated by the Tamil people. It is a time for thanksgiving and for celebrating the arrival of the harvest season. The festival is marked by feasting, dancing, and singing. Boat races are not a special feature of Pongal.