Explanation

Option B is correct as reports indicated clashes involved workers from PPP and PTI. Option A is incorrect because it lists PAT & TLP which were not the primary parties mentioned for this specific clash. Option C is incorrect because PMLN & MQM-P were not the main groups cited in relation to these particular clashes. Option D is incorrect because while PPP was involved, MQM-L is not the correct pairing based on available information.