Answer:
The correct answer is letter "C": The price of Under Munich's stock suddenly increases, and then remains at that price.
Explanation:
Market efficiency indicates that stock price at any given time will fully reflect all available and relevant information. The efficient market hypothesis has three levels that describe market efficiency: strong efficiency, semi-strong efficiency, and weak efficiency.
In that sense, option "C" reflects a positive immediate change in Under Munich's stock price because of the news on footwear developments they are carrying out.