The correct answer is option 'B' - Jharkhand, Odisha, West Bengal.

Tropical deciduous forests, also known as monsoon forests, are a type of forest that occur in areas with a distinct dry season and a wet season. These forests are found in several regions of India, but the states of Jharkhand, Odisha, and West Bengal are particularly known for their tropical deciduous forests.

Here is a detailed explanation of why these states are the correct answer:

1. Jharkhand:
Jharkhand is located in the eastern part of India and is known for its rich forest cover. The state is home to several national parks and wildlife sanctuaries, which are predominantly covered by tropical deciduous forests. Some of the popular national parks in Jharkhand, such as Betla National Park and Palamau Tiger Reserve, are known for their diverse flora and fauna that thrive in the tropical deciduous forest ecosystem.

2. Odisha:
Odisha, also located in the eastern part of India, has a varied topography and climate that supports the growth of tropical deciduous forests. The state is known for its dense forest cover, with the Simlipal National Park being one of the most important protected areas in the region. The national park is known for its rich biodiversity and is primarily covered by tropical deciduous forests.

3. West Bengal:
West Bengal, situated in the eastern part of India, is another state where tropical deciduous forests occur. The state has a diverse range of ecosystems, including the Sunderbans, a unique mangrove forest ecosystem that is a UNESCO World Heritage Site. Apart from the Sunderbans, other regions of West Bengal, such as the Buxa Tiger Reserve and the Neora Valley National Park, are known for their tropical deciduous forests.

These three states, Jharkhand, Odisha, and West Bengal, share similar climatic conditions and geographical features that are conducive to the growth of tropical deciduous forests. The presence of these forests in these states is not only important for maintaining the ecological balance but also for providing habitat to a wide range of plant and animal species.

In conclusion, the tropical deciduous forests occur in Jharkhand, Odisha, and West Bengal due to their suitable climatic conditions and geographical features. These forests play an essential role in maintaining biodiversity and supporting various ecosystems in these states.