Answer:
Most forgetting occurs after several days of learning the material.
Explanation:
The forgetting curve theory or hypothesis determines the decline of the memory power to time. This curve shows how some information are deleted or erased from the memory as time progresses if no step is taken to retain them.
This curves was given by Ebbinghaus. It states that most of learned knowledge are lost from the memory over days of time if not it is reviewed timely again and again.