Directions: The following question presents a sentence, part of which or all of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

Clark and Florence Wallace, a husband-and-wife medical team, worked steadily and efficiently through the night, but sipping their coffee the next morning, she noticed that he seemed disoriented.

The modifier 'sipping their coffee the next morning' creates ambiguity about who was sipping coffee. Since 'their' is plural, it could refer to both Clark and Florence. Option C resolves this by using 'as they sipped their coffee the next morning' which clearly shows both people were sipping coffee together, then 'she noticed' specifies Florence observed his disorientation. Options A and B have dangling modifier issues where it's unclear who is doing what action. Options D and E create awkward constructions that don't clearly establish the sequence of events.