Arrange the following incidents in chronological order:

1- Beginning of Gupta rule
2- Chinese pilgrim Xuan Zang visited Pataliputra
3- Era of Chandragupta-II's reign
4- Accession of Chandragupta Maurya

Choose the correct answer from the given options:

4-1-3-2

The correct answer is Option 3 - 4-1-3-2

Correct chronology of given events:

4-321 BCE: Accession of Chandragupta Maurya

1-320 CE: Beginning of Gupta rule

3-375-415 CE: Era of Chandragupta-II's reign

2-606-647 CE: Chinese pilgrim Xuan Zang visited Pataliputra