The correct answer is (c), Rudradaman.
Rudradaman was the ruler of the Western Satraps from 130 to 150 CE. He was a great conqueror and expanded his kingdom to include much of present-day Gujarat, Rajasthan, and Madhya Pradesh. He was also a patron of the arts and literature, and is credited with building many temples and other monuments.
One of Rudradaman’s most important achievements was the construction of a dam on the Girnar River. This dam was built to provide water for irrigation and drinking water for the people of the region. It is one of the oldest dams in India and is still in use today.
The other options are incorrect. Chandragupta Maurya was the founder of the Mauryan Empire in the 4th century BCE. Asoka was the grandson of Chandragupta Maurya and the greatest ruler of the Mauryan Empire. Skandagupta was the grandson of Asoka and the last great ruler of the Mauryan Empire.
Chandra Gupta Maurya did not take any initiative for water resource management in the Girnar region. Asoka did take some initiatives for water resource management, but they were not as significant as those of Rudradaman. Skandagupta did not take any initiatives for water resource management in the Girnar region.