Which of the following is the largest fair of West Bengal?

Correct option is B

The correct answer is (b) Gangasagar Mela.
Explanation: 

• The Gangasagar Mela is one of the largest and most significant fairs in West Bengal.
  
•  It is held annually at Sagar Island, where the Ganga River meets the Bay of Bengal.
  
• This mela is a major pilgrimage and religious gathering for Hindus, where devotees take a holy dip in the confluence of the river and the sea, believing it will cleanse their sins.
  
•  The event attracts millions of visitors, making it the largest fair in West Bengal.

Here’s a brief about the other options:

• ​  Rass Mela: This is a fair held at Nabadwip in Nadia district, known for its religious significance but is not as large as the Gangasagar Mela.
  
• Joydeb Kenduli Mela: This fair is celebrated in Birbhum district in honor of the poet Joydeb and features Baul music and performances.
  
•   Ramkeli Mela, Malda: This is a religious fair celebrated in Malda district and has significance but is not the largest in the state.

Therefore, Gangasagar Mela is the largest fair in West Bengal.