What was the most prominent reason of arrival of Indo-A

What was the most prominent reason of arrival of Indo-Aryans from central Asia , possibly from the south of the Urals and East of Caspian Sea?

[A] They were in search of arable land
[B] They were of Nomadic Culture
[C] They were defeated by their Indo European neighbors
[D] They were aware of prosperity of India

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This question is part of UPSC Prelims Practice and Mock Tests membership programme.