Learners are being trained to work on a new system that will be introduced to their company in two weeks. The learners are initially frustrated by the new system. The trainer maintains a supportive attitude and assures them that they are doing very well. The class learns how to use the system. Which of the following BEST describes the instructional technique used by the trainer in this situation?

A.
Effective use of presentation skills

B.
Effective positive reinforcement

C.
Effective use of media

D.
Effective use of evaluation techniques