You have a Microsoft 365 subscription and Microsoft 365 E5 licenses assigned to your users. You are using PIM and have created an access review for reviewing privileged roles, scoped at users. You have set Reviewers to be Manager: 

You want to automatically remove access for users who are denied. If the manager does not respond to the access review within a given timeframe, you want to remove access for the users. 
How should you configure the Upon completion settings? 

Answer options:

A.Enable “Auto apply results to resources” and select “No change” under “Should the reviewer not respond.”
B.Enable “Auto apply results to resources” and select “Take recommendations” under “Should the reviewer not respond.”
C.Enable “Auto apply results to resources” and select “Remove access” under “Should the reviewer not respond.”
D.Disable “Auto apply results to resources” and select “Remove access” under “Should the reviewer not respond.”

Correct Answer: C 
You should enable Auto apply result to resource. This will make sure the user`s access is automatically removed if the review is denied by the reviewer. You should also set “Should reviewer not respond” to “Remove access” to make sure the user`s access is removed if the reviewer does not respond.
Option A is incorrect. This will leave access unchanged if the reviewer does not respond.
Option B is incorrect. This will not remove the access automatically If the reviewer does not respond.
Option D is incorrect. You should enable “Auto apply results to the resources” 
Reference: 
To know more about creating an access review, please refer to the link below: 

https://docs.microsoft.com/en-us/azure/active-directory/privileged-identity-management/pim-resource-roles-start-access-review