Explanation: You are looking for a policy that excluded a particular people from migrating to a particular country. This would be the White Australia Policy, (B), which allowed only English-speaking immigrants (typically from United Kingdom nations) to enter Australia. Eliminate (A), as the Open Door Policy was a trade policy with China. The Meiji Restoration was the process of Japanese modernization by adopting Western influence, so get rid of (C). Russification is not correct, as it refers the process of non-ethnic Russians forced to take on characteristics of Russian culture; eliminate (D).