The answer must be something that is common to both hobbit homes and earthships. Of the above choices, only generating water by collecting rainwater is common to both. So the answer is (D).
Hobbits traditionally live in "Hobbit-holes", or smials, underground homes found in hillsides, downs, and banks, though others lived in houses. Earthships are a type of sustainable home that are designed to be self-sufficient. They are built with natural and recycled materials, such as tires, cans, and bottles.
So, The answer must be something that is common to both hobbit homes and earthships. Of the above choices, only generating water by collecting rainwater is common to both. So the answer is (D).
The probable question may be from the article"Would You Live Here?" and the diagram for the question is attached below.