Each of the Following Would Tend to Weaken the Semi-Strong

Multiple Choice

Each of the following would tend to weaken the semi-strong form Efficient Market Hypothesis except

A) There is publicly available information that Boeing Aircraft has procured a contract to build 25 planes for the US Government and the price of Boeing quickly goes up.
B) ACG, Inc.performed well for the past six months, but they just lost a major distribution contract, but the price of ACG shares continues to go up.
C) Woolworth announces higher sales turnover this quarter, and the share price remains stable.
D) Muguet Company consistently underperforms the market in October, but outperforms the market in May.