Final answer:
The theory among the options provided is that the Colonists integrated with local native groups to ensure their survival.
Step-by-step explanation:
A theory among the options provided is D. The Colonists integrated with local native groups to ensure their survival. A theory is an explanation or interpretation of facts or evidence that is supported by a body of evidence and has not been disproven. In this case, the theory suggests that the colonists at Roanoke integrated with local native groups to stay alive, which is supported by historical evidence.
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