Explanation
Chandragupta Maurya fought Seleucus I Nicator around 305 BCE. Their settlement transferred eastern territories to Chandragupta and established diplomatic relations between the Mauryan and Seleucid courts. Therefore this option matches the accepted historical association and chronology. Alexander died before the Mauryan–Seleucid settlement, Antiochus I belongs chiefly to Bindusara’s diplomatic context, and the other names do not fit the chronology and identity of Chandragupta’s opponent.