Which of the following sentences uses
the correct subject/verb agreement?
A. Clearly, the puppies or their mother is responsible for
this mess!
B. Frankly, I think the puppies nor at least their mother
need more room to romp.
C. Undoubtedly, Mikki or her sisters needs to take better
care so the dogs don't get out.
D. Undoubtedly, her sisters nor Mikki need to take better
care so the dogs don't get out.