An instructor is presenting to a class and notices that a particular learner is not paying attention; however, when the instructor gives a pop quiz, this learner earns the best grade. Which of the following BEST describes the situation? 

Answer options:

A. The quiz did not cover the class concepts effectively
B. The learner has mastery of the information tested.
C. The quiz motivated the learner.
D. The answers to the pop quiz were distributed prior to class

B