The correct answer is option 3 - Maurya. Ashoka was a king from the Maurya dynasty. This dynasty was one of the most powerful and significant dynasties in ancient India. It was founded by Chandragupta Maurya in 322 BCE and lasted until 185 BCE.

The Pradyota dynasty (option 1) was an ancient dynasty in northern India, but it predates the Maurya dynasty. The Haiyanka dynasty (option 2) is not a known dynasty in Indian history. The Nanda dynasty (option 4) was another ancient dynasty in India, but Ashoka`s reign came after the downfall of the Nandas.

It is worth mentioning that although the provided answer is generally correct, the correct answer should be: Alert - correct answer should be option 3 - Maurya.