Why did Ming leaders believe that foreign trade had negative effects? A. Foreign trade led to other nations invading China.
B. The trade led to higher taxes on the richer classes in China.
C. Too much money was spent on trade and not on building projects.
D. Trade interactions led to societal changes that weakened Chinese culture.

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities