The Prarthana Samaj was a socio-religious reform movement in India that emerged in the 19th century. It aimed to promote social and religious reforms and uplift society. Among the demands made by the Prarthana Samaj, three of them were in line with their objectives.

Option 1: Women education - This was one of the demands of the Prarthana Samaj. They emphasized the importance of educating women to help them gain knowledge, empowerment, and equality in society.

Option 2: Widow remarriage - The Prarthana Samaj strongly advocated for widow remarriage, considering it as a social reform that would help widows lead a normal life and reduce their social stigma.

Option 3: Raising the age of marriage for boys and girls - This was another demand of the Prarthana Samaj. They believed in raising the minimum age of marriage for boys and girls, as child marriage was prevalent during that time and had negative consequences.

Option 4: Abolition of untouchability - This option is given as the correct answer, but it is incorrect. The Prarthana Samaj did indeed demand the abolition of untouchability, as they aimed to eradicate social inequalities and promote unity among different castes and communities.

In conclusion