First of all, Party A will not consider it. There is a residential entrance road behind it.
Room B looks at the astrolabe at the same time in the Eighth National Games. There should be water if it is a mountain, and there should be water if it is a mountain.
Next, let's consider C and D. From the astrolabe, Wangshan just fits in with the external environment.
Give priority to room C, with good lighting. Although it is close to the residential road, it doesn't matter if it is close to the dragon. It would be better if the dragon side is still a little far from the road. Moreover, the south suggests that we can see the wealth of water, and room C should be better than room D.