这道题为什么不选A，behavioral portfolio theory不是用于mental accouting的情况吗？
题目：
(from a client): “I follow a disciplined approach to investing. When a stock has appreciated by 15 percent, I sell it. Also, I sell a stock when its price has declined by 25 percent from my initial purchase price.”
The client of Statement 6 is most likely behaving consistently with:
A prospect theory.
B expected utility theory.
C behavioral portfolio theory.
答案：Prospect theory is an alternative to expected utility theory. This theory describes how individuals make choices in situations in which they must decide between alternatives that involve risk and how they evaluate potential losses and gains. Prospect theory considers how alternatives are perceived based on their framing, how gains and losses are evaluated, and how uncertain outcomes are weighted.
