Why did the European nations increase their military's size?

answer:

Between 1890 and 1913, the European powers at the time began building up in military power. This included the countries of Britain, France, Germany, Russia, and Austria-Hungary. The reason for the military buildup was primarily nationalism in which each country wanted to be "better" than the others.

Explanation:

the chinese were most interested in gold

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your answer would be (b)