A likely reason the majority of immigrants who passed through Ellis Island were European while the majority who passed through Angel Island were Asian is that

Ellis Island was the main immigration station in New York, on the East Coast, while Angel Island was in San Francisco, on the West Coast. Europe is closer to New York, and Asia is closer to San Francisco, so immigrants often arrived at the station nearest their region of origin. Therefore, choice D is correct.

AI-written and checked against the verified answer.