The award conferred for significant contributions to social justice and welfare in Tamil Nadu is the:

Periyar Award
Ambedkar Award
Padma Bhushan
Ramon Magsaysay Award

The correct answer is Periyar Award.

The Periyar Award is a prestigious award given to individuals who have made significant contributions to social justice and welfare in Tamil Nadu. The award is named after E. V. Ramasamy Naicker, popularly known as Periyar, who was a social reformer and freedom fighter who fought for the rights of the oppressed in Tamil Nadu.

The award is given by the Periyar Dravidar Kazhagam, a political party founded by Periyar. The award is given annually to individuals who have made significant contributions in the fields of social justice, education, health, and other areas.

The Periyar Award is a highly respected award and is considered to be one of the highest honors that can be bestowed on an individual in Tamil Nadu.

The other options are incorrect because they are not awards that are given for significant contributions to social justice and welfare in Tamil Nadu.

The Ambedkar Award is an award given by the Government of India to individuals who have made significant contributions to the upliftment of the Scheduled Castes and Scheduled Tribes.

The Padma Bhushan is an award given by the Government of India to individuals who have made distinguished service in any field.

The Ramon Magsaysay Award is an award given to individuals who have made outstanding contributions to the public service, community leadership, journalism, literature, creative arts, and the performing arts.