Answer:
a. the spacing effect
Explanation:
The spacing effect: In psychology, the term spacing effect was first introduced by a German psychologist named Hermann Ebbinghaus, and is defined as the phenomenon which suggests that the long-term memory of an individual is increased when the learning related to different events are being spaced apart in interval of time instead of occurrence in immediate succession.
Example: Remembering items in a list.
In the question above, the given statement illustrates the spacing effect.
