B. Tested arrivals about their health and whether they were fit to work.
Explanation:
Ellis Island is an island in New York Harbor that plays a major role in inspecting and acting as the major point of transition or threshold for the immigrants entering America. It was also a processing point for the millions of immigrants from 1892 to 1954.
One of the important roles that this federally-owned island is its role in processing and inspecting the incoming immigrants into the American nation. It was here that any incoming immigrants were tested about their health, and processed according to their ability to be released to enter America or be held further in the island until they are fit.
