Why did measles spread so quickly in the Faroe Islands in 1846 after it was brought to the area by a global traveler?

Question

A. As inhabitants of the islands had not been exposed to measles for 65 years, most of the population had no immunity to the virus.
B. As inhabitants of the islands had never been exposed to measles before, they had no immunity to the virus.
C. As inhabitants of the islands had last been exposed to measles 65 years previously, the older population had immunity to the virus passed to younger generations.
D. As inhabitants of the islands did not have access to the measles vaccine, they had no immunity to the virus.

Answer 1

A. As inhabitants of the islands had not been exposed to measles for 65 years, most of the population had no immunity to the virus.