Explanation: The trade pattern in question is the acquisition of silver from India and Japan to purchase goods from China. The Japanese government under the Tokugawa Shogunate would close Japan off to all foreign merchants save the Dutch who had to operate under severe limitations, limiting the amount of silver that could be drawn out of Japan. Eliminate (A) because Russia’s eastward expansion made little impact on silver flows in East Asia. Eliminate (B) because the Portuguese never conquered India. Eliminate (D) because Spanish silver from Mexico strengthened the trade system more than weakened it. Choice (C) is correct.