For the first question, I don't understand why (B) is not the correct choice.
From what I gathered from the passage, the author believes that custom-made medical illustrations would a visual presentation of data that otherwise would be complex (lines 50-55). So wouldn't road maps (a visual representation for verbal directions) be the most analogous? It would be difficult to understand verbal directions about an area that one was unfamiliar with and the map would be much easier to comprehend.
I guess I can see why (A) is the credited answer if I think about it like the engineer is giving a presentation with complicated engineering data, formula, etc. Or wait, I think maybe I answered my own question? Would it simply be because the schematics accompany the oral presentation and in the map/directions analogy, the map does not supplement any other presentation? Maybe I over thought this - any one with any feedback? Thanks in advance.