Which of the following correctly defines the independent variable in a study?
A) The feature(s) of the study that are used to explain or explore the participant's behavior.
B) The factor(s) that are measured or observed as the outcome or response in the study.
C) The variable(s) that are held constant throughout the study to ensure consistency.
D) The factor(s) that may influence or affect the outcome or response variable in the study.
