The correct answer is option 2, The East India Association.

Option 1, The Bengal British India Society, is not the correct answer as it was not founded by Dadabhai Naoroji in London in 1866.

Option 3, The British Indian Association, is also not the correct answer. While there was a British Indian Association, it was not founded by Dadabhai Naoroji in London in 1866.

Option 4, The Madras Native Association, is also not the correct answer. The Madras Native Association was founded by P. Anandacharlu in Madras (now Chennai) in 1885.

Alert - correct answer should be The East India Association, which was indeed founded by Dadabhai Naoroji in London in 1866. This association played a significant role in advocating for the rights and interests of Indians living in British India. It aimed to foster understanding between British officials and Indian representatives and promote Indian national interests. Dadabhai Naoroji, also known as the Grand Old Man of India, was a prominent Indian nationalist and one of the early leaders of the Indian independence movement.