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The correct answer is - military man prepared to survive in the wilderness.
Even though the first settlers of Jamestown were young and middle aged man that had military experience, and they were considered as tough man that would be able to survive in the wilderness, it didn't turned out as planned. The first settlers were totally clueless about their environment, they were catching lots of diseases and lots of them died because of that. They were not very efficient in the agricultural field, so they starved very often, and for some time relied on the natives for food. All in all, they were in terrible state, and Jamestown was on the verge of collapse for most of the time.
The correct answer is A.
The expression birds of passage was used to refer to temporary migrants, who moved to obtain those job positions which are considered of low-quality by native-born workers. The term was used at first in the 1840s, to refer to British inmigrants and continued to be used along the 20th century with the arrivals of European, Asian or Latin American migrants.