Which of the Following Is True of Static Group Comparison

Which of the following is true of static group comparison?

A) It is useful in cases where a researcher can control or predict whether,when,or how the stimulus is administered.
B) It includes experimental groups that were determined by random assignment.
C) It includes experimental and control groups determined by factors other than random assignment.
D) It excludes the comparison control group that did not experience the stimulus.
E) It includes control groups that were determined by random assignment.