问题
单项选择题
Studies from which form(s) of the efficient market hypothesis (EMH) provide evidence that security prices adjust so quickly to a public announcement that it is not possible for investors to realize significant abnormal returns after a public announcement has been made()
A. semip-form of the EMH.
B. weak-form of the EMH
C. p-form of the EMH
答案
参考答案：A
解析：
Event study results provide strong evidence in support of the semistrong-form of the EMH. However, time series and cross-sectional tests provide mixed evidence of semi-strong form efficiency.