The choice that combines the given sentences most effectively is: Option C : furnished: their.
Sentence correction or sentence improvement is a type of grammatical practice where a sentence is given with a word or a phrase that requires grammatical changes or improvement.
Now, here in the given sentence:
"The plainer rooms are more sparsely furnished. Their architectural features, furnishings, and decorations are just as true to the periods they represent",
The most suitable choice, by sentence correction, to combine the two sentences will be: Furnished: their (option C).
To learn more about sentence correction, refer to the link: https://brainly.com/question/14632568
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