Group the Objects into Classes So That All the Elements

Multiple Choice

Group the objects into classes so that all the elements within each class are topologically equivalent and no elements from different classes are topologically equivalent.
A. a bolt
B. a brick
C. a horseshoe
D. a pencil

A) A; B, C and D
B) A, C and D; B
C) A, B, and D
D) A, B, C, and D
E) A, B and C; D