The correct option is B Assam
Tropical evergreen or Rain forests occur over equatorial or sub equatorial regions with abundant warmth and rainfall (200 - 350 cms/year) almost throughout the year. The forests are impenetrable with maximum diversity. Productivity is also maximum. Standing crop biomass is highest. Soil is highly leached due to heavy rains and is therefore poor in nutrients. Large quantity of nutrients remain locked in vegetation. In India, these forests are common in Western Ghats, some parts of Eastern Himalayas e.g : Assam region and Andaman's.