Why did the tokugawa shogunate close Japan to foreign influences?

As Europeans were exploring Asian countries with the goal of creating trade agreements, many areas were experiencing a push of western culture. To prevent the influence of western culture, the Tokugawa Shogunate refused westerners and made western culture unlawful. The samurai also resented western influence because it promoted the status of merchants and degraded their own position in society.

- "a new era of american politics began with jackson's election in 1828, but it also completed a grand social experiment begun by the american revolution. nevertheless, jacksonian democracy represented a provocative blending of the best and worst qualities of american society."

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i think the answer is a and i hope this ; ))