Mauryan Empire
Megasthanes, the ambassador of Selucus at the Mauryan court in Pataliputra, wrote an account of the period in his book

Both (b) and (c)
Travels of Megasthanes
Indika
Indicoplecusts

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Mauryan Empire
How did the Maurya Empire finally end?

The last Mauryan ruler was killed by his General
The last Mauryan ruler was killed in a battle with the foreign invader from the north-west
The last mauryan ruler had no heir and the throne was claimed by one of his powerful ministers
The Kanvas of Central India deposed the last Mauryan ruler

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