Which of the Following Is an Example of "Type Technique

Multiple Choice

Which of the following is an example of "type technique" of variation of the independent variable?

A) All participants' reaction times are measured after being given a drug
B) In a study of success in passing the bar, one group studied independently, another as a group, and a third paid for a review class
C) The control group got no study aids, one experimental group got a graphic organizer, and a second experimental group got copies of the teacher's notes
D) An experimental group had a review session before taking a test and the control group took the test when the unit was complete