17.     which one of the following sentences contains an abstract noun?                 a.  she handed him the dishtowel.      b.  his smile could charm anyone.      c.  logic is easily understood.      d.  the vase was quite expensive.

C would be the right answer since you can't "see" understanding

jim mohr

explanation:

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."