Pakistan's political crisis deepened on Thursday, with a defiant Nawaz Sharif rebuffing the ruling PPP government's offers for talks as police lathi-charged activists and detained politicians and lawyers which demanded the immediate reinstatement of the sacked judges.
Answer: B
It should read who demanded.
The relative pronoun refers to politicians and lawyers, who are people, so it must be who, not which or that in this context. The tense stays simple past to match the rest of the report.
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