The correct answer is: a) Asom Ratna
Asom Ratna is the highest civilian award of Assam. It is awarded to individuals who have made outstanding contributions to the state in the fields of art, literature, education, science, social service, sports, and other fields.
Asom Saurav is a civilian award of Assam given to individuals who have made significant contributions to the state in the field of sports.
Asom Gaurav is a civilian award of Assam given to individuals who have made significant contributions to the state in the field of art and culture.
Asom Bibhushan is a civilian award of Assam given to individuals who have made significant contributions to the state in the field of literature and education.