Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Which one of the following statements best describes the semi-strong form of market efficiency?
Option A:Empirical tests examine the historical patterns in security prices.
Option B:Security prices reflect all publicly known and available information.
Option C:Semi-strong-form efficient markets are not necessarily weak-form efficient.

Answer: B