Effective training is most successful when it is relevant and engaging for the learners. Therefore, by tailoring the training to the career goals and needs of trainees (B), you can increase their motivation and retention of the material. Using a single method for all (A) may not cater to different learning styles. While questions are important, discouraging them until the end (C) can hinder immediate understanding. Avoiding negative feedback (D) can prevent trainees from correcting mistakes and improving. (Fundamentals of Crew Leadership, Fourth Edition, NCCER, Section 5.2.1 Principles of Effective Training)