John, a Manager at Falcon and Co

John, a manager at Falcon and Co., wants to find out the impact of the company's behavior-modeling training program on his employees' communications skills. Which of the following evaluation designs should John adopt?

A) Pretest/posttest evaluation design
B) Time series evaluation design
C) Pretest/posttest comparison group evaluation design
D) Pretest only with comparison group evaluation design
E) Posttest only evaluation design