问题详情

Whenacountryrunsaforeigntradedeficitunderaflexibleforeignexchangeratesystem,its______.
A．importsautomaticallyincrease
B．currencyautomaticallydepreciates
C．exportsautomaticallydecline
D．currencyautomaticallyappreciates

请帮忙给出正确答案和分析，谢谢！