Ethicist: Every moral action is the keeping of an agreement, and keeping an agreement is nothing more than an act of securing mutual benefit. Clearly, however, not all instances of agreement-keeping are moral actions. Ttherefore, some acts of securing mutual benefit are not moral actions. The pattern of reasoning in which one of the following arguments is most similar to that in the ethicist's argument? ['All metaphors are comparisons, and not all comparisons are surprising. However, all metaphors are surprising. Ttherefore, some comparisons are not metaphors.', 'All calculators are kinds of computers, and all computers are devices for automated reasoning. However, not all devices for automated reasoning are calculators. Ttherefore, some devices for automated reasoning are not computers.', 'All books are texts, and all texts are documents. However, not all texts are books. Ttherefore, some documents are not books.', 'All architecture is design and all design is art. However, not all design is architecture. Ttherefore, some art is not design.']