NCARB test - Why lot B instead of D
Lot D doesn't interfere with the drainage path and is right along the street. I don't understand why NCARB choosing lot B as the answer. 
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Looking at the options and the program to meet: A is too far from the street to have the requested visibility, and C will interfere with the existing landscaping. D will interfere with site drainage, as it's interfering with the runoff flow (see below). B makes the most sense as it does not disrupt the site in a way that will affect the natural runoff pattern and is visible from the street.
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I appreciate you marking it up, but I don't think the runoff of this site works like this. I thing it is more toward the middle rather than the entire site. I reread the question and I think I see what I missed. the question says the inventory with most visibility NOT sales and service building. They are two different buildings, so the inventory is B and sales and service is D.
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The sales and service building will be the permanent structure that is being located on the plan. Inventory parking will fall wherever on the site that can meet the requirements, but that's solving for another problem. The footprint of option D as drawn disrupts the drainage on site as it exists now; water running from the top of the site to the detention pond would not flow past the corners of the footprint evenly, diverting and disrupting the current drainage pattern of the site.
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The main difference between B and D is in the question: Owner wants to locate vehicle inventory with maximum visibility from the street. Option D blocks the vehicle inventory view from the street, while option B does not. B and D are approximately equal in terms of the drainage and landscaping criteria.
A and C don't meet the criteria for maintaining drainage and/or landscaping.
Also -- these are locations of structures on a single lot. Not 4 individual lots.
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