In a reasonably efficient market, at the time of an announcement, market prices react to:

A. The annoucement of new information that was unanticipated. B. The announcement of new information that was previously fully anticipated C. Both of the other responses are correct (i.e. both the announcement of new information that was previously fully anticipated, as well as information that was unanticipated D. Non of the other responses are correct because market price movements are random