A new and very expensive training program will be implemented in your organization and it is very important to find out if the training has a positive effect on trainees' job performance. You are responsible for designing the evaluation. What training evaluation data collection design will you recommend?

A) post-test only
B) pre-post design
C) pre-post with control
D) time series

Pre-post with control design is the most appropriate for evaluating the effectiveness of the new and expensive training program. This design involves comparing the performance of two groups: the experimental group who received the training and the control group who did not receive the training. This design allows for the identification of the training effects, controlling for external factors that may affect job performance. It also allows for the comparison of the performance of the experimental and control groups before and after the training, ensuring that any change in performance is due to the training itself. The other designs are not as robust as the pre-post with control design.