关于债券的含义，下面说法错误的是( )。

A．投资者是借出资金的经济主体

B．发行人只需要在一定时期归还本金

C．债券反映了发行者和投资者之间的债权、债务关系，而且是这一关系的法律凭证

D．发行人是借入资金的经济主体

"The foreign teachers wondered what we Chinese teachers do in political meetings and I told them that we had to go through the ______ of lengthy formalities. "

A. rigmarole
B. significance
C. commiseration
D. implication