这是六级一题阅读理解,应该选什么

这是六级一题阅读理解,应该选什么
though Hu and the rest of the Chinese leadership aren't inclined to lecture visiting Presidents, he might gently hint that Beijing is getting a little nervous about the value of the dollar — which has fallen 15% since March, in large part because of increasing fears that America's debt load is becoming unmanageable.
That's what happens when you're the world's biggest creditor: you get to drop hints like that, which would be enough by themselves to create international economic chaos if they were ever leaked. (Every time any official in Beijing deliberately publicly about seeking an alternative to the U.S. dollar for the $2.1 trillion China holds in reserve, currency traders have a heart attack.) If Americans saved more and spent less, consistently over time, they wouldn't have to worry about all that.这个是阅读理解题,题目是
In what circumstances do currency traders become scared?
应该选A
When Beijing mentions in public the huge debts America owes China.

还是选B beijing想用另一种货币替代美元