'Sundarbans' are found in which of the following state of India?

The Sundarbans is the world's largest mangrove forest, forming part of the delta created where the combined waters of the Ganga, Brahmaputra, and Meghna river system meet the Bay of Bengal. It is home to the Royal Bengal Tiger, and UNESCO-listed World Heritage properties exist on both the Indian side (Sundarbans National Park) and the Bangladeshi side (The Sundarbans).

In India, the entire Sundarbans region lies within the state of West Bengal, spread across the North 24 Parganas and South 24 Parganas districts along the Bay of Bengal coast. The Indian portion includes the Sundarbans National Park and Tiger Reserve, administered by the West Bengal Forest Department, alongside inhabited areas under separate civil administration.

Checking the other options against this delta system:

• Maharashtra sits on India's western coast along the Arabian Sea, far from the Ganga-Brahmaputra delta system.

• Gujarat also lies on the western coast along the Arabian Sea, on the opposite side of the subcontinent from the delta.

• Uttar Pradesh is a landlocked northern state with no sea coast, so no coastal delta can form there.

Since only West Bengal borders the Bay of Bengal at the mouth of the Ganga-Brahmaputra system, West Bengal is the correct answer among the given options.