Answered

 



Which sentence contains a punctuation error?

  A. The ex-coach also teaches physics, so she still has plenty to do.

  B. A large yellow cat with a self-satisfied look on its face sat on the steps.

  C. The Fourth of July is an all American holiday.

  D. Our senator-elect will be moving to Washington soon.






















 



A.





The ex-coach also teaches physics, so she still has plenty to do.
























 



B.





A large yellow cat with a self-satisfied look on its face sat on the steps.
























 



C.





The Fourth of July is an all American holiday.
























 



D.





Our senator-elect will be moving to Washington soon.




Answer :

A ex-Coach needs to be capitalized
AL2006
This is awfully picky, but I think "all-American" (in C) needs a hyphen.