Which of the Following Is a Problem Associated with Turnover

Which of the following is a problem associated with turnover measures used as criteria in a validation study?

A) While voluntary turnover can be effectively measured, involuntary turnover measures can be confounded.
B) While involuntary turnover can be effectively measured, voluntary turnover measures can be confounded.
C) Measures of both voluntary and involuntary turnover can be confounded.
D) It is not possible to control for tenure differences in turnover measures.