The most accurate response reflecting the impacts of British and American imperialism still visible in Asia today is:
China has adopted Western culture.
This response highlights the lasting influence of Western imperialism on various aspects of culture, society, and politics in many Asian countries, including the adoption of certain Western practices and ideas.
The other options are factually incorrect: Japan no longer holds imperial power in Hong Kong, Korea is not an imperial territory of Japan, and while Hong Kong does have complex political discussions surrounding its relationship with both Britain and China, simply saying it "shows political influences of imperialism" is too vague and not entirely accurate in the contemporary context.