Which of the Following Is an Example of Sampling-On-The-Dependent Variable

Multiple Choice

Which of the following is an example of sampling-on-the-dependent variable?

A) To find out why teams are successful, only successful teams are studied.
B) To find out why teams are unsuccessful, only unsuccessful teams are studied.
C) To find out whether performance reviews help teams, some teams are given performance reviews while others are not; and the effect on performance is measured.
D) a & b