单选题:What does the author imply by saying "the theory is unproven

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题目内容:
What does the author imply by saying "the theory is unproven" ( Line 5, Para.4) ? A.Americans won't benefit from their investments in emerging market
B.It's not definite that the emerging markets will be a solutio
C.Developing countries will be the baby-boomers' only hop
D.America should solve the pension problem by selling their assets no
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