Stream of consciousness rationale: To arrange them as described I did as follows on my scratch paper (see the file attached), where I counted 4 sides
The question and answer pair are described below.
Q: Suppose you have three identical prisms with congruent equilateral triangles as the end-polygons. Suppose you attach them by the rectangular faces so they are perfectly aligned. There will be some large faces created by two or more co-planar faces of the individual prisms: count each such large face as one. Given that, how many faces does the resultant solid have
Options:
(A) 4
(B) 6
(C) 9
(D) 10
(E) 12
A: (A)