The period in which Japan quickly modernized its military and industrialized its economy is known as the Meiji Restoration. In the 19th century, Japan and China were both made aware of the significant gaps in development between their countries and the Western Powers that they were increasingly in contact with. Japan, unlike China at the time, chose to emulate these powers and open up relations with them in order to learn from them, and in an impressive amount of time, totally transformed the economy and military of its nation.
As a result, Japan became an imperial power, invading a claiming neighboring territories, and entering conflict with existing imperial powers such as Russia.
The best answer is A.
