Which of the Following Statements Is True of Comparison Groups

Multiple Choice

Which of the following statements is true of comparison groups?

A) The use of a comparison group poses a threat to internal validity.
B) Comparison group consists of a group of employees who do not attend the training program.
C) Employees in a comparison group have personal characteristics that are different from other trainees.
D) Use of a comparison group in training evaluation increases the possibility that changes found in the outcome measures are due to factors other than training.