Although perceived as a modern convenience, _________
Which choice completes the text so that it conforms to the conventions of Standard English?
historical records show that underfloor heating was utilized by wealthy Romans.
underfloor heating was utilized by wealthy Romans, according to historical records.
Rome's historical records show the use of underfloor heating.
wealthy citizens in Rome utilized underfloor heating, records show.
Correct Answer: B
Choice B is the best answer. The introductory phrase "Although perceived as a modern convenience" describes a specific technology. "Underfloor heating" is the correct subject to follow the modifier.
Choice A is incorrect because "historical records" are not perceived as a modern convenience. Choice C is incorrect because "Rome's historical records" are not the heating system. Choice D is incorrect because "wealthy citizens" are not the convenience.