Which is the dependent and independent variable?

The independent variable is what you are changing. In this case it would be the belief of the staff. The researchers changed what they told the different people.
The dependent variable is what is being measured. In this case it is the physical health of the staff.
Hope this helped !
<3

Idon’t see any choices but i think it’s because it’s the work for that class and so the teacher doesn’t get confused