Which of the following most accurately describes a derivative security A derivative:()

A. has a payoff based on another asset. 

B. always increase risk. 

C. has no expiration date.

道德主要通过（）

A.都是调节人们行为的规范

B.两者的社会基础不同

C.行为者道德良心引导人们自觉遵守社会的道德规范和准则

D.国家机器的强制性力量来制约人们的社会行为

E.产生和发展的趋势相同