The highest civilian honor conferred by the Arunachal Pradesh government is the:

The correct answer is: d) Tomo Riba Award

The Tomo Riba Award is the highest civilian award conferred by the Government of Arunachal Pradesh. It is named after Tomo Riba, the first Chief Minister of Arunachal Pradesh. The award is given to individuals who have made outstanding contributions in the fields of art, literature, education, social service, science and technology, sports, and public administration.

The other options are incorrect because:

• Arun Ratna is a state award given by the Government of Odisha.
• Bhupen Hazarika Award is a national award given by the Government of India.
• Lummer Dai Award is a state award given by the Government of Nagaland.