Option (A) is the correct answer.
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Answer:
An alliance is a union or association formed for mutual benefit, usually between countries or other organizations. This is seen as one of the causes of WW1 because countries involved in the developing conflict brought their allies into it as well. Serbia relied on their allies such as Russia, France, and Britain, while Austria called on the Ottoman Empire and Germany.
They both agreed to let the Europeans. Take half and the tainos take half