The correct answer is: A) Boat building.
The snake boat (Chundan Vallam) is a traditional boat used for racing and other water sports in Kerala, India. It is made of a long, narrow hull with a pointed bow and stern. The hull is made of wood, and the boat is decorated with intricate carvings. The boat is powered by a team of oarsmen, who sit in rows along the sides of the boat. The snake boat is a symbol of Kerala’s rich culture and heritage.
Option B, metal casting, is incorrect because the snake boat is made of wood, not metal.
Option C, jute weaving, is incorrect because the snake boat is not made of jute.
Option D, spice trading, is incorrect because the snake boat is not used for trading spices.