The correct answer to the question is option 2, Haji Shariatullah. The 19th Century Faraizi Movement in eastern Bengal developed under his leadership.

Now, let`s briefly explain each option for a better understanding:

1. Titu Rai: There is no significant historical evidence or connection of Titu Rai with the Faraizi Movement. It is not correct.

2. Haji Shariatullah: He is indeed the correct answer. Haji Shariatullah was a Muslim religious reformer and the leader of the Faraizi Movement in the 19th century. He advocated for social and religious reforms among the Muslims in Bengal.

3. Shah Sayyid Ahmad: Shah Sayyid Ahmad was a prominent Muslim scholar and reformer, but he was not associated with the Faraizi Movement. It is not the correct answer.

4. Dudu Miyan: There is no historical record of Dudu Miyan`s involvement in the Faraizi Movement. It is not the correct answer.

In conclusion, option 2, Haji Shariatullah, is the correct answer as he was the leader of the 19th Century Faraizi Movement in eastern Bengal.