问题如下：
To better advise the firm’s clients on the likelihood of
currency crises, Analyst Kwantries to formulate an early warning system for the
episodes of currency crises. She recognizes that a typical currency crisis
tends to be triggered by a number of economic problems, not just one.
选项：
A. correct
B. incorrect, because
there are few historical crises involving currencies of countries with sound
economic fundamentals
C. incorrect, because
there are few historical episodes in which a sudden adverse shift in market sentiment
occurs that is unrelated to economic fundamentals
解释：
Even countries with sound economic
fundamentals can be subjectto a currency crisis, including instances when
market sentiment shifts for noneconomic reasons.
解析：即使那些经济基本面良好的国家也可能遭遇货币危机，包括市场情绪因非经济原因而发生变化的情况。因此只有A选项是正确的。
