There is no way to answer that Shaibaz. What do you mean by "Retailer A checked member 2, 3 and 4"? Checked how? Is there a dashboard or viz that only shows one "member" at a time? If not, how would Retailer A "check" a member?
If you are trying to determine what things a user looked at inside a viz or dashboard, there is an Extension that might get you what you want: https://extensiongallery.tableau.com/products/24