解释一下B为什么不对

问题如下：

The best way to assess an investor's engagement success is to consider:

选项：

A.the impact the engagement had on the investee's stock price. B.the improvements in the investee's corporate governance policies and practices. C.the outcome of the investor's engagement actions against engagement objectives related to the investee.

解释：

C is correct. Setting clear objectives for engagements is critical for investors; meeting these pre-established objectives is the correct way to assess the success of engagements. PRI recognizes the importance of the engagers applying milestone measures and KPIs (key performance indicators) in their engagement actions so they can be accountable to their clients based on meeting the KPIs (PRI 2018d). Measuring engagement success based on the stock price performance or improvements in policies at the investee level might not be as accurate as measuring engagement actions against engagement objectives.