Concept:The Seleucid-Mauryan War was fought between Chandragupta Maurya and Seleucus I Nikator. It ended with a peace treaty in 303 BCE.Explanation:In 305 BCE, Seleucus I tried to reclaim the Indian satrapies left by Alexander the Great. Chandragupta Maurya fought back to defend and expand his empire. The war lasted until 303 BCE, when both sides made peace. Seleucus lost the war and surrendered several territories, including Gandhara and Arachosia. In exchange, Chandragupta gave Seleucus 500 war elephants. These elephants later helped Seleucus win the Battle of Ipsus in 301 BCE. The timeline of the war is therefore from 305 BCE to 303 BCE.Answer:C. 305 - 303 BCE