Why Did the Worldwide Silver Economy Become a Problem for the Ming

Why did the worldwide silver economy become a problem for the Ming dynasty?

A) Foreign purchases and silver coming into the country could be unreliable.
B) Since pirating was a serious problem, the Ming tried to control seaborne commerce.
C) A consistent supply of silver coming into the country was necessary as it affected tax revenues.
D) Depending on the supply of silver, prices could reach inflationary rates.
E) All of these