In the description of the following experiment, determine the experimental factor. During a study testing a new face wash on acne, the research team grouped the volunteers enrolled for the test into Group A and Group B. Group A received a generic wash while Group B received the new face wash.

Select the correct answer below:

whether or not a person has a lot of acne

the face wash received by each group

the group receiving the new face wash

the effectiveness of the face wash