Which one of the following sentences includes an error in subject-verb agreement? a. either june or her children are going to the movie tonight. b. carrie and lucille work in the cafeteria. c. neither hannibal nor her pups is in the kitchen. d. laverne, who's married, and shirley, who's single, both walk their dogs.

The sentence that includes an error in the subject-verb agreement is:

A. Either June or her children are going to the movie tonight. 

This sentence should read:
Neither June nor her children are going to the movie tonight. 
"Nor" and "neither" go together and they are the negative form of "or" and "either". "Or and "either" are the positive form of "nor" and "neither". 
A good example of using "or" and "either" is the following sentence:You can either run or cycle to the shops.