The correct option is (c).
Explanation: Chandragupta Maurya defeated Seleucus Nikator, a general of Alexander. Chandragupta fought to regain Alexander's satrapies. Seleucus I Nicator fought to defend these territories but both sides made peace in 303 BC. The treaty ended the Seleucid–Mauryan war and allowed Chandragupta to control the regions it was warring for.