PART a All College Professors Are Teachers, So All Teachers

Short Answer

PART A All college professors are teachers, so all teachers are educators, since all college professors are educators.
This argument is correctly symbolized as follows: PART B
Which of the following substitutions proves the argument invalid?
A) C = mammals, E = animals, T = fish.
B) C = cats, E = mammals, T = animals.
C) C = animals, E = mammals, T = cats.
D) C = dogs, E = animals, T = mammals.
E) C = cats, E = dogs, T = mammals.