The semistrong form of the emh states that must be reflected in the current stock price.
a. all security price and volume data
b. all publicly available information
c. all information, including inside information
d. all costless information

b. all publicly available information

Explanation:

Semi-strong form of the  EMH (abbreviation of  Efficient Market Hypothesis) assume that the current stock prices adjust rapidly to the release of all new public information.

In a PhD dissertation by U. S. economist Eugene Fama, there're a theory that at any given time and in a liquid market, security prices fully reflect all available information