All those who keep a journal will be heard by the next generation. Some of these journal writers are true artists, others humorous observers of the commonplace, and still others insufferable egotists who feel compelled to record their every thought.
If the statements above are true, which one of the following must be true?
(A) Not all of those who are humorous observers of the commonplace will be heard by the next generation.
(B) Everyone who will be heard by the next generation keeps a journal.
(C) The next generation will hear both insufferable egotists and true artists.
(D) Some of those who keep journals are not true artists, humorous observers of the commonplace, or insufferable egotists.
(E) The next generation will bear some of those who are true artists but not all of them.
I would go (C).
A - We don't know... maybe EVERY humorous observer keeps a journal, so EVERY one of them will be heard, or maybe not, we can't be sure.
B - Reversed logic
D - we have not idea whether the categories of people listed above are the ONLY ones who keep journals, maybe, maybe not, we have no way of finding out.
E - Again, if ALL true artists keep journals, then the next generation WILL hear ALL of them, if not, then gen-X won't, either way, we don't know for sure.
(C) We know that some artists & egotists keep journals, & we know that ALL who keep journals will be heard, so we know for sure that gen-X WILL hear at least some artists & egotists. This MUST be true.