I did not include all undergraduate schools in the university I graduated from. Have I lost my chance at ever applying to graduate school?
On the basis of your "further clarification", I suppose that your grades at A and B were bad and that's why you mentioned only C when applying to D.  Now, when you apply to graduate school, you will probably be asked, as part of the application, to provide information about (and probably transcripts from) all the undergraduate institutions you ever attended.  If you're asked that, then you should honestly include all of A, B, C, and D.  You should explain the situation, emphasizing that (if I correctly understood your "further clarification") you became much more mature between B and C, and that therefore your record at A and B has become irrelevant.  (You should explain this so clearly that there will be no need for a clarification and further clarification.)