What Was the Primary Reason for the Slowdown of Technology

Multiple Choice

What was the primary reason for the slowdown of technology after Yongle's death?

A) limitation of the mining industry by the Ming empire.
B) Japanese coastal piracy prevented transmission of new ideas and techniques.
C) a religious edict by the conservative traditional elements
D) collapse of the economy with the flood of silver from Spanish and Portuguese explorers.
E) none of these