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**The professor's lectures, ___ are renowned for their clarity, often attract international students.** Correct:

Awhich
Bwhom
Cwho
Dthat
Answer & Solution
Correct answer: A. which
Refers to LECTURES (not a person), and the relative clause is non-restrictive (set off by commas) — use 'which'. 'Who/whom' is for people. 'That' would mean the clause is restrictive (essential to identifying the lectures), but the commas signal it's non-restrictive, so 'which'.
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