Which of the following can be inferred from the passage about the Native American inhabitants of Ungava Bay？

A. They were almost all killed by the 1952 epidemic.
B. They were immunologically defenseless against measles.
C. They were the last native people to be struck by a virgin-soil epidemic.
D. They did not come into frequent contact with white Americans until the twentieth century.
E. They had been inoculated against measles.