In the 15th century, China stopped trading with other areas of the world and became increasingly isolated. Which of these demonstrates that this action was the result of China's fear of cultural change? A) China took this action in order to control all trade along the Silk Road. B) China took this action to encourage its citizens to fight again Mongol invaders. C) China took this action at the demand of Confucian scholars who tired of barbarian contact. D) China took this action to eliminate the migration of Chinese people to other parts of the world.