The correct answer is any substance or environmental factor other than a steroid
The independent variable is the factor or behavior that is manipulated by the experimenter in order to observe the effect of that manipulation on another factor or behavior that is the dependent variable. To you It is also called the experimental or active variable.
C is the main resaons su:cide is also one! they took posion when they were scared and they would die from they posion but Gunshot wounds is the main one