Question: This question refers to the following information.
The condition of foreign states is not what it once was; they have invented the steamship, and introduced radical changes in the art of navigation. They have also built up their armies to a state of great efficiency and are possessed of war implements of great power and precision, in short have license to be formidable powers. If, therefore, we persistently cling to our antiquated systems, heaven only knows what a mighty calamity may befall our Empire.
—Adapted from a letter written by NAME_1 to NAME_2, 1847
The era in Japanese history following this passage is known as the
A: Meiji Restoration.
B: Heian period.
C: Tokugawa Shogunate.
D: Jomon period.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option. Do not include the following keywords: passage, change, army, efficiency
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