The correct option is option-2, which states that the Prarthana Samaj was based in Maharashtra.

Let`s analyze each option to understand why option-2 is the correct answer and why the other options are incorrect.

Option-1 states that the aim of Prarthana Samaj was to reform Hindu society. This statement is correct, as one of the main objectives of Prarthana Samaj was to bring about social reforms in Hindu society.

Option-2 states that Prarthana Samaj was based in Maharashtra. This statement is correct. Prarthana Samaj was indeed founded in Maharashtra, specifically in Mumbai, in the late 19th century by Atmaram Pandurang.

Option-3 states that Prarthana Samaj believed in monotheism. This statement is incorrect. Prarthana Samaj was not centered around monotheism. It aimed to promote rational thinking, social equality, and the study of all religions, but it did not advocate for the belief in a single god.

Option-4 states that Prarthana Samaj greatly influenced the Brahmo Samaj. This statement is incorrect. While both Prarthana Samaj and Brahmo Samaj were reform movements in India, they had different origins and ideologies. Prarth