IMO B, others have agreement errors.

In weekend seminars, the celebrated dog trainer prohibited that the owners of certain breeds should not pet their dogs unless the dogs had been performing satisfactorily.


A. that the owners of certain breeds should not pet their dogs unless the dogs had been performing

B.owners of certain breeds from petting their dogs until the dogs had performed

C.an owner of certain breeds to pet his or her dog unless the dog was performing

D.the owners of certain breeds to pet their dog until the dog had performed

E.owners of certain breeds should not pet his or her dog unless the dog had performed[/quote]

IMO Three issues here.

1. Idiom prohibit X from Y.
2. Wrong usage of should.
3. Using dog instead of dogs.

That leaves only one i.e. B.