Final answer:
The phrase 'that adds wonderfully to the confusion' distinctly indicates a confused tone in 'The Yellow Wallpaper' by verbally expressing the narrator's disorientation.
Step-by-step explanation:
The phrase from the sentence in "The Yellow Wallpaper", which best shows a confused tone, is 'that adds wonderfully to the confusion'. This phrase explicitly conveys the sense of bewilderment experienced by the narrator due to the complex and convoluted patterns of the wallpaper she is describing.
The other descriptive elements in the phrase, such as 'sprawling outlines' and 'optic horror', contribute to this tone by adding a sense of overwhelming and disorienting visual stimulus, which further emphasizes the confused state of the narrator's mind.