Chronological order: Mahapadma Nanda (Nanda dynasty, c. 345 BCE), then Chandragupta Maurya (founder, c. 322 BCE), Bindusara (c. 297 BCE), Ashoka (c. 268 BCE), and Brihadratha (last Mauryan, c. 187 BCE). So (a), (e), (d), (b), (c), which matches option 2.