Open Door Policy was that it showed that the US alone of all the major powers of the time cared at least a little for Chinese independence and sovereignty. It did not stop the other powers from violating both, but it did at least slow them down a little.
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An argumentative text claims that a certain opinion is the only valid opinion.
Answer: A. Especially
Explanation:
Definition of Especially - To an extent or degree deserving of special emphasis; particularly.