案例分析题 According to the passage, which of the following was the earliest kind of ’exchange of wealth（）

A．a bank is closed for one or more days
B．too many depositors try to draw out their money at one time
C．there is not enough money to pay all its depositors at one time
D．tellers of a bank take their own money from the bank

A．surprised
B．pleased
C．refused
D．increased