A private agreement between two parties to
题型：单项选择题
问题：
A private agreement between two parties to exchange a series of future cash flows, with at least one of the two series of cash flows determined by a later outcome, is best characterized as a (n) :
A．
| A. swap. |
B．
| B. futures contract. |
C．
| C. over-the-counter contingent claim. |