18번 관련해서요 궁금한게 있어서요..

18번다음의 This가 가리키는 것으로 가장 적절한 것은?
This refers to a kind of building for sheltering animals, their feed, farm supplies, farm machinery, and farm products. Sometimes this is used for storing hay and grain, too. The need for this has declined with the introduction of tractors and electrical services. Traditionally, wood was used in constructing this, but sheet steel and aluminum have been increasingly used since World War 2, particularly on large farms in North American and European conuntries. This usually consists of two stories, the first to shelter animals or machines and the second to store hay or grain.

답이 barn이잖아요... 근데요..빨간 책으로 표시해 놓은 부분이 barn 하고 무슨 관계인지 모르겠어요..
문화적인 지식이 없어서 그런가요..?
혹시..아시는 분 설명 부탁드려요..
감사..^_^