SAT Math Practice Question

A retail company has 50 large stores located in different areas throughout a state. A researcher for the company believes that employee job satisfaction varies greatly from store to store. Which of the following sampling methods is most appropriate to estimate the proportion of all employees of the company who are satisfied with their job?

1. A.Selecting one of the 50 stores at random and then surveying each employee at that store
2. B.Selecting 10 employees from each store at random and then surveying each employee selected
3. C.Surveying the 25 highest-paid employees and the 25 lowest-paid employees
4. D.Creating a website on which employees can express their opinions and then using the first 50 responses