Why does it make a difference whether the speech in which Coors was engaged (disclosure of the alcohol content) was commercial speech or noncommercial speech?

Identify the sentence in which the underlined word or words are punctuated incorrectly. a) pam was (well prepared) for the debate. b) she had (read three quarters) of the material more than once. c) she has always been (self assured). d) the winner needs a (two-thirds) majority of the votes.