Step 1: Recall historical background.
The Mauryan Empire was the first major empire in India that unified large parts of the subcontinent under centralized rule.
Step 2: Identify the founder.
Chandragupta Maurya, with the guidance of Chanakya (Kautilya), defeated the Nanda dynasty around 321 BCE and established the Mauryan Empire.
Step 3: Eliminate wrong options.
- (B) Ashoka: A great ruler of the Mauryan dynasty, but not the founder. He came later (grandson of Chandragupta).
- (C) Bimbisara: Ruler of the Haryanka dynasty of Magadha, not related to the Mauryan Empire.
- (D) Ajatashatru: Another Magadha ruler, much earlier than the Mauryan period.
Step 4: Conclusion.
Therefore, Chandragupta Maurya is the founder of the Mauryan Empire.