What Was the Cultural Relationship Between Harappan Civilization and the Aryans

What was the cultural relationship between Harappan civilization and the Aryans?

A) The Aryans adopted nearly all the cultural attributes of the Harappans including urbanization and political centralization.
B) The Aryans rapidly assimilated the Harappan agricultural techniques including massive irrigation projects, but rejected all else.
C) The Aryans accepted the Harappan religious pantheon, but were unable to achieve the technological proficiency of the Harappans.
D) There was little continuity between Harappan and Aryan cultures.