i got that wrong yesterday too.. did the same thing you did. The answer choice C is wrong because you are looking at it from the front/back view. And that column that sticks up in answer choice c can be seen in the figure given, but however the column in answer choice C is longer than it should be, so that answer is wrong. if you look at the bottom/top end view, the correct answer comes out to be choice B; those steps are made by those protruding blocks in the front face