The correct answer is: b) Rudradaman
Rudradaman was the grandson of Chandragupta Maurya and the son of Ashoka the Great. He was the governor of the Girnar (Saurashtra) region from 150 BCE to 120 BCE. He is best known for his victory over the Sakas and his construction of the Rudra Dam on the Narmada River.
Pushyagupta was a Mauryan general who served under Ashoka the Great. He is best known for his role in the Kalinga War.
Chandragupta II was the grandson of Ashoka the Great and the son of Bindusara. He was the most powerful Mauryan emperor and is best known for his conquests of the Deccan and the Kalinga region.
Bindusara was the son of Ashoka the Great and the father of Chandragupta II. He was the third Mauryan emperor and is best known for his expansion of the Mauryan Empire.