老师，请问下第12题是怎么计算的？

老师好，百题投资第7题，看了解析，还是似懂非懂。 Value and momentum are opposite each other in that value investing is inherently stabilizing. It is a negative feedback strategy where stocks that have fallen in value eventually are priced low enough to become value investments, pushing prices back up. Momentum is inherently destabilizing. It is a positive feedback strategy where stocks that have been increasing in value are attractive to investors, so investors buy them, and prices increase even more. Momentum can be riskier than value or size investing in that it is more prone to crashes. 价值策略是负反馈，追涨杀跌是正反馈是什么意思呢？价值策略不是HML吗？不是买入价值高的卖出价值低的么？怎么说是股票价格足够低成为价值投资呢？请老师帮助理解一下这部分内容，谢谢

请问这道题怎么做？谢谢

为什么答案选D，其他几个选项是什么意思？

为什么选择C不选B？

B选项为什么不正确？

第二句话为什么不正确？

有分散化效果，但是各个风险之间不是有相关性加强效果吗？

A选项relatively low mode 是什么意思？

A选项如何通过asset/liability mix 来改变相关性？B，C选项错在哪里？