'First it is staying out late, then it is not calling home, then wild parties, and before you know it, your life will be completely out of control.' Which informal fallacy is committed in the given argument?

Consider the following argument: 'UGC NET toppers study 12–14 hours daily. Therefore, anyone who studies 12–14 hours daily will become a UGC NET topper.' The argument commits which of the following logical fallacies?

A fallacy in which a proposition is held to be true just because it has not been proved false, or false just because it has not been proved true, is called: