Extract:
Which word is used incorrectly in the following sentence?
That is the doctor who’s diploma is hung on the partition.
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A
That
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B
who’s
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C
hung
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D
partition
The word "who's" is used incorrectly; the possessive pronoun "whose" is required to show the diploma belongs to the doctor.
A) That
"That" is correctly used as a demonstrative pronoun introducing the relative clause. No error affects this word.
B) who's
"Who's" is a contraction of "who is" or "who has"—completely incorrect when possessive relationship is needed. The diploma belongs to the doctor, requiring possessive "whose" (no apostrophe), not the contraction "who's."
C) hung
"Hung" is correctly used as past participle of "hang" for objects (not people). No error affects this verb form.
D) partition
"Partition" is correctly used as a noun describing a dividing wall. No error affects this term.
Conclusion
"Who's" (contraction) versus "whose" (possessive) represents a critical homophone error. Possessive relationships with people require "whose" without apostrophe—making "who's" grammatically incorrect despite correct pronunciation.