for 14, you immediately cancel out choices A and D (D can't be true cause for it to be true, you got to have the bottom base in an angle like it shows in choice B)
now we go into more detail for the remaining answer choices B, C, E. Choice C got more steeper lines. The triangles of the main object are more broader. C's out.
Choice B looks pretty nice, but if you extend the angle of the half cut base in our main object, it meets a little above the middle of the triangle leg. the angle points near the peak of the triangle. and in choice B the half base angle points at near the base of the triangle. I don't know how to explain this honestly, and I don't know if my explanation is correct, but this is how I figured it could not be B.
From the left side view, Choice E fits perfectly.
Hope this helped?