Circle the letter of the sentence in which the word in bod faced type is used incorrectly

1. a. although a creator and *proponent* of the atomic bomb, robert oppenheimer became an opponent of it's case.
b. cinderella becomes the *proponent* character in the fairy tale when the matching slipper fits her foot rather than those of her stepsisters.
c. growing up poor and having no formal education, president andrew johnson became an enthusiastic *proponent* of public schools.
d. mother jones was such a vocal *proponent* of child labor laws and concern for the poor that she sometimes went to jail for her beliefs.