An ancient Roman mosaic floor depicts a complex geometric pattern. It was likely produced by artisans laying tiles in sections and then connecting them. It is possible the team had never attempted a floor this large, and some researchers claim that a close look at the grout lines—the spaces between the tile sections—suggests the workers improved their technique over time. For example, the first section shows uneven spacing, whereas the later sections are perfectly aligned.
Which choice best describes the function of the underlined sentence in the text as a whole?
It identifies the specific location of the Roman villa.
It supports an argument about the artisans' learning process during construction.
It compares the mosaic to other floors in the region.
It explains why the mosaic has been damaged over time.
Correct Answer: B
Choice B is the best answer. The text suggests workers improved over time. The underlined sentence gives a specific example (first section bad, later sections good) to support this claim.
Choice A is incorrect. No geographical location mentioned. Choice C is incorrect. It compares sections within the same mosaic. Choice D is incorrect. It discusses construction technique, not damage.