If a Stock Price Follows a Random Walk,the Price Today

Multiple Choice

If a stock price follows a random walk,the price today is said to be equal to the prior period price plus the expected return for the period with any remaining difference from the actual return considered to be:

A) a predictable amount based on the past prices.
B) due to new information related to the stock.
C) related to the security's risk.
D) related to the risk-free rate.
E) an overall market abnormality.