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Option 1: "average family"
Explanation: The text discusses how Henry Ford's innovations in assembly line production made automobiles more affordable, specifically mentioning that by 1924, a Model T was within reach of the 'average family.' This directly supports the idea that the correct answer is 'average family,' as it aligns with the main idea of accessibility to automobiles for typical households.
Option 2: "urban infrastructure"
Explanation: This option does not relate to the text's focus on affordability and accessibility of automobiles. 'Urban infrastructure' refers to the physical structures and facilities in cities, which is not mentioned or implied in the context of Ford's production methods or the pricing of the Model T.
Option 3: "global ecosystems"
Explanation: The phrase 'global ecosystems' is unrelated to the content of the text. The text centers on automobile manufacturing and pricing, with no reference to environmental systems or global ecological concerns, making this option irrelevant.
Option 4: "technological advancements"
Explanation: While the text does mention technological innovations in the context of assembly line production, the specific phrase 'technological advancements' does not complete the sentence meaningfully. The focus is on the affordability for the 'average family,' not on the advancements themselves.
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