(A) Modern research, however, has proved that there were invaders even before the Aryans poured into this land.
(B) It was thought that they came to a country which was uncivilised and barbarian.
(C) They had evolved a civilisation higher than that of the Aryans hordes who came in their wake.
(D) Till recently the Aryans were regarded as the earliest invaders of the land.
In this questions, four sentences are given, denoted by (A), (B), (C) and (D). By using all these four sentences, you have to frame a meaningful paragraph. Choose the correct order of the sentences from the four alternatives.