【正确答案】 A

【答案解析】[解析] 本题考查细节理解。根据limited liquidity(流动性限制)可确定答案所在的句子：This system provided an automatic correction for some trade imbalances，but it had little liquidity(the money supply could not expand as rapidly as required by expanding trade)，and it was vulnerable to short-term changes in the gold supply．特别是括号中的解释(资金供养
不能根据货币需要而增加)，因此[A]为正确答案。选项[B]，[C]和[D]均与第二段内容相反。