The correct answer is: d) More than 2000 mm.
Assam is a state in north-eastern India. It is located in the Brahmaputra Valley, which is a major river basin in the region. The average annual rainfall in Assam is about 2,500 mm. This makes it one of the wettest states in India. The monsoon season is from June to September, and during this time, the state receives most of its rainfall. The rainfall is essential for the state’s agriculture and economy.
Option a) is incorrect because the average annual rainfall in Assam is more than 500 mm.
Option b) is incorrect because the average annual rainfall in Assam is more than 1000 mm.
Option c) is incorrect because the average annual rainfall in Assam is more than 2000 mm.