What Was the Purpose of the White Australia Policy

What was the purpose of the White Australia Policy?

A) to encourage Australians of European descent to migrate from Australia's densely settled east coast to the more sparsely settled interior and west coast
B) It was an ethnic isolationist policy established by the Australian government, which sought to place the country's entire aboriginal population on reservation-like holdings in the far western portion of the country.
C) to promote immigration of (white) North Americans and Europeans to Australia at the expense of non-white groups
D) to clean up the country's white sand beaches, which had been seriously polluted by mining
E) to promote the emigration of Australians who were of European descent to other nations in the South Pacific