Research comparing rates of major depressive disorder with seasonal pattern in Canada and Iceland has demonstrated that
A. all populations living at high latitudes are equally likely to experience the condition.
B. more Canadians experience the condition than Icelanders, suggesting that Icelanders may have developed some genetic protections against the condition.
C. more Icelanders experience the condition than Canadians, suggesting that Canadians may have developed some genetic protections against the condition.
D. native Icelanders or Canadians were unlikely to experience the condition, but people who migrate to those countries are more vulnerable to the condition.
Answer: B
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