Starting in the fifteenth century, leaders in China and Japan decided to cut off contact with other countries. Which was not a reason for doing this? A. They feared their people would no longer be self-sufficient and would rely on trade with foreigners. B. They feared outsiders wanted to change their traditional practices and beliefs. C. They feared European nations would see how poor and underdeveloped the Chinese and Japanese civilizations were. D. They feared European nations might someday threaten their rule.