对话理解
听力原文：W: I know there are some elements which will affect the investors' searches for the highest possible returns. What are they?
M: Risk aversion, lack of time, lack of skill, and other mortal conditions.
Q: Which of the following doesn't belong to the elements which will constrain the investors' searches for the highest possible returns?
(11)
A．Risk aversion.
B．Lack of time.
C．Lack of skill.
D．Enough time.