Step 1: Understanding the Concept:
The Sudarshana Lake in Junagadh, Gujarat, is famous in Indian history for being maintained by several dynasties over centuries.
Step 2: Detailed Explanation:
The Sudarshana Lake was originally an artificial reservoir built during the Mauryan period under Chandragupta Maurya.
In the 2nd century CE, a massive storm destroyed the embankments of the lake.
Rudradaman I, a Shaka (Indo-Scythian) ruler of the Western Kshatrapas, undertook the task of repairing and rebuilding the dam.
Crucially, he did this using his own personal wealth without imposing any extra taxes ({vishti}) on his subjects.
This achievement is recorded in the Junagadh Rock Inscription, which is the first major inscription written entirely in Sanskrit.
Step 3: Final Answer:
The lake is Sudarshana. Therefore, option (d) is the correct answer.