**The author's argument, ___ I find compelling, has been widely criticized.** Correct relative pronoun:
Athat
Bwho
Cwhich
Dwhom
Answer & Solution
Correct answer: C. which
Refers to an idea (the argument), not a person — use 'which' (or 'that').
'Who/whom' refers to people.
The clause is non-restrictive (set off by commas), so 'which' is correct.
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