Answer: A. She believes the company has become riskier, and therefore increases her required rate of return for the stock.
Step-by-step explanation:
The formula for the Constant dividend growth model of valuing stock is:
= Next dividend / (Required return - growth rate)
From the formula above, one can tell that if the required return is higher, it would result in a lower value for stock because it would divide the numerator more.
If the analyst believes that the company is riskier and increases the required return, the value would therefore reduce if other measures are kept constant.