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Which form of efficient market is most likely to be indicated by this share price movement?

A listed company has recently announced a profit warning.

The company’s share price fell 20% on the day of the announcement but had been fairly static in the weeks leading up to the announcement.

Which form of efficient market is most likely to be indicated by this share price movement?
A . Weak form
B . Semi-strong form
C . Strong form
D . Random walk

Answer: B

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