Answer:
The correct answer is e. learning curve.
Step-by-step explanation:
A learning curve describes the degree of success obtained during learning over time. It is a diagram in which the horizontal axis represents the elapsed time and the vertical axis represents the number of successes achieved in that time.
Many mistakes are often made when starting a new task. In the later phases the errors diminish, but also the new learned subjects, until arriving at a plain.
It is also possible that the result of the learning process is random, so that the apprentice only believes to learn or forget something (nodeterministic experiment).