One learner has been talking to another learner since class began. The other learner appears uncomfortable but continues to respond to the learner’s comments. The instructor continues to teach the class without addressing the situation. Which of the following BEST describes the error the instructor has made in this situation?

A.
Failure to control the learning environment effectively

B.
Failure to establish and maintain instructor credibility

C.
Failure to use instructional methods appropriately

D.
Failure to gain sufficient information about the audience