If you want to find out if an acc has recovery just login.
There will stand if an acc has recovery or not
Sample picture just from google:
If you want to delete recovery's you must have all Informations from the accs, else it wont work.
Go to "Recovery Password" , then fill in the username, then click on "Recovery Stolen Password" (We know that your acc isnt stolen, but it is the only way to reset the recovey questions)
Note: Provide so much information as you can, else your acc is going to be locked