So first of all i need to know what it the thing they are asking that would influence the person? What is the action? Based on you're comment below I will then comment back with the answer, Thank You
Answer:
A longitudinal study
Explanation:
A longitudinal study can be used to discover relationships between variables that are not related to various background variables. This observational research technique involves studying the same group of individuals over an extended period.
All of the above, they all apply.
Mild stimulation and muscle reaction. Cigarettes make you feel calm
