休克时微循环障碍的实质是：（）

A.微循环收缩或扩张失调

B.毛细血管内血液淤滞或凝血

C.动、静脉短路开放

D.毛细血管壁损伤和渗出

E.毛细血管血液灌流减少

An analyst does research about equity valuation and gathers the following information about a company and the economy. The current share price is $45, the price-to-earnings ratio is 15, the nominal risk-free rate is 3.1%, the risk premium is 7%, and the expected retention ratio is 40%. The best estimate of the company's dividend growth rate is:（）

A. 6.1%

B. 7.4%

C. 14.1%