Answer: D. third-class and steerage-class passengers
Explanation:
Once the immigrants reached Ellis Island, the first and second class passengers were allowed to get off at New York harbour. The third class and steerage-class passengers however, would be sent to Ellis island.
On Ellis island, the passengers would go through medical examinations and cross examination to determine if they were fit enough to enter the US. The logic was that people in third and steerage classes were more likely to be diseased as they were poorer.
