Ok so I am positive the answer is the lesson/moral of the story this is because when searching upon what the theme is; the theme is the message or meaning the work (or story) is trying to communicate (or tell) you. Hope this helps oiiiiiiii!!!!!!!!!
Is there some choices to choose from?
<em>basically im is used for not and here impossible means that anything which is not possible .. here main root or word is Possible because im is only a prefix .. this prefix 'im' changes the meaning of possible and makes it impossible :)</em>