Explanation
Correct answer: A.
Choice A is the best answer because it most accurately describes how the underlined portion functions in the text as a whole. The first two sentences of the text establish that in California, houses were heated by building fires year-round. The underlined portion then indicates that the fires didn’t merely provide physical warmth: they also represented being "home" and feeling protected. The underlined portion thus illustrates that a fire provides comfort beyond physical warmth.
Why the other choices are wrong
Choice B
Choice B is incorrect because the underlined portion doesn’t summarize information that came before it. Whereas the previous two sentences describe fires’ ability to provide physical warmth to homes, the underlined portion focuses on the psychological comfort the fires offered.
Choice C
Choice C is incorrect. Although the text’s second sentence mentions that fires were built in the summer because fog came in, which may have cooled the house, this detail isn’t the focus of the underlined portion. Instead, the underlined portion indicates that fires were built for reasons beyond physical warmth: to create a sense of being home and safe.
Choice D
Choice D is incorrect because the underlined portion focuses on the emotional significance the author places on having a fire going inside the home. There is no indication that the author feels equally comfortable without a fire present.