After the Introduction of Paper Money in China Caused Economic

After the introduction of paper money in China caused economic instability, the Mongols restored a degree of economic stability by producing copper coinage and:

A) decreasing tax collection temporarily.
B) shifting the emphasis of coinage to silver instead of other metals.
C) cutting off trade with Japan to stem the flow of copper exports
D) diversifying trade agreements with western Europe.
E) creating a favored nation trade status with whichever nation would agree to reduced tariffs.