Who among the following rulers adopted the title "Devaputra" or 'Son of god'?

Kushana Rulers

The correct answer is Option (4) → Kushana Rulers

Colossal statues of Kushana rulers have been found installed in a shrine at Mat near Mathura (Uttar Pradesh). Similar statues have been found in a shrine in Afghanistan as well. Some historians feel this indicates that the Kushanas considered themselves godlike. Many Kushana rulers also adopted the title devaputra, or “son of god”, possibly inspired by Chinese rulers who called themselves sons of heaven.