2010 mock afternoon Q93 2010, instrument, afternoon, agreement, something

saylove

A derivative is most accurately defined as a financial instrument that provides:
A. a return based on the return of another asset.
B. an adjustment to another assets's level of risk
C. an agreement between two parties to provide something for each other

答案是B 但是他的解释是

Its return is derived from another underlying asset.

在2010mock的erreta里面没有这道题的更改  请问正确答案应该是A么？

saylove

万分感谢哦