The correct answer is A: 1-a, 2-b, 3-c, 4-d.

1–A: Ashoka is renowned for the conquest of Kalinga (c. 261 BCE), after which he embraced Buddhism and promoted Dhamma.

2–B: Akbar founded Din-i-Ilahi, a syncretic movement drawing from Hinduism, Islam, Zoroastrianism, and Christianity to foster unity.

3–C: Shivaji Bhonsle founded the Maratha Empire and challenged Mughal authority in the Deccan through guerrilla warfare.

4–D: Megasthenes visited Chandragupta Maurya's court at Pataliputra and recorded his observations in Indica.