PART a Some Entertainers Are Not Magicians, for Some Comedians

Short Answer

PART A Some entertainers are not magicians, for some comedians are not magicians and some magicians that are not comedians are entertainers.
Which of the following correctly expresses the form of this argument? PART B
Which of the following substitutions proves the argument invalid?
A) M = mammals, C = animals, E = dogs.
B) M = cats, C = trees, E = animals.
C) M = mammals, C = cats, E = animals.
D) M = animals, C = trees, E = cats.
E) M = fish, C = dogs, E = mammals.