What Does Weak Form Efficiency Imply

Multiple Choice

What does weak form efficiency imply?

A) Portfolio diversification is ineffective as all prices are interrelated.
B) Past price movement is unrelated to the movement of future prices.
C) Abnormal returns will disappear within a trading day.
D) Price patterns that existed in the past will reappear in the future.
E) A stock with a highly positive serial correlation in the past will maintain that correlation in the future.