Answer:
A. The civilization must make extraordinary achievements in areas such as art and science.
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The answer is letter A.
Tokugawa’s sons controlled the cities of Mito, Wakayama, and Nagoya. The Tokugawa clan<span> is considered as one of the powerful family during their era. <span>The Tokugawa family consists of three houses, this includes the Mito, Owari (Nagoya city), and the Kishu (Wakayama city).</span></span>