[ANSWERED] If you are working at the word level on [s], which of the following would represent combining work..

If you are working at the word level on [s], which of the
following would represent combining work on phonology and morphology?
a. working on third-person singular forms
b. working on expanding sentence structures
c. working on new vocabulary words with [s] in the final
position
d. working on subject versus object pronouns she and her