Answer:
e) severity of the seizure
Step-by-step explanation:
A relation between two variables is established when one of the variable changes with the other.
The variable which changes on its own and does not change because of the other variable is called the independent variable.
The dependent variable is the variable that changes due to a change in the independent variable.
Here, the affect of the seizure is being studied on the bystanders i.e., whether they left their cubicles to help the alleged victim of a seizure.
Hence, the independent variable is the severity of the seizure and the number of people who left their cubicles is the dependent variable.