A thesaurus is a book that's useful for finding 
 a. frequently misspelled words. 
 b. synonyms. 
 c. definitions. 
 d. famous quotes. user: freewriting is an exercise in which you 
 a. write only grammatically correct sentences. 
 b. rewrite an article in a magazine or newspaper. 
 c. write whatever thoughts come to mind. 
 d. revise and polish an essay.