It can be deduced that best type of green roof for their space is D. Extensive.
What is an extensive roofing?
It should be noted that an extensive roofing simply means an ecological alternative that's important to protect laters such as gravel and pavers.
In this case, since the hotel wants to develop a green roof that is easy to maintain and the roof can only support about 20 pounds per square foot, the extensive roofing is appropriate since they've a shallow build up height.
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