Any writer whose purpose is personal expression sometimes uses words ambiguously. Every poet' s purpose is personal expression. Thus no poetry reader' s enjoyment depends on attaining a precise understanding of what the poet means. The conclusion can be properly inferred if which one of the following is assumed? ["Most writers whose readers' enjoyment does not depend on attaining a precise understanding of the writers' words are poets.", 'Readers who have a precise understanding of what a writer has written derive their enjoyment from that understanding.', 'No writer who ever uses words ambiguously has any reader whose enjoyment depends on attaining a precise understanding of what the writer means.', 'Writers whose purpose is personal expression are unconcerned with whether anyone enjoys reading their works.']