Option d is the correct answer. Rudradaman I, the ruler of the Western Kshatrapas dynasty, renovated the Sudarshan Lake without using forced labor. The Junagadh inscription, found on a rock in Junagadh, Gujarat, provides historical evidence of this event. The inscription mentions Rudradaman's efforts in maintaining and repairing the Sudarshan Lake's irrigation system, highlighting his contributions to water management and infrastructure development.