Concept:The sentence must begin with the broad subject, followed by the verb, and then list the specific items.Explanation:Start with the subject: “the various categories of water” (R).Then add the verb phrase: “pollution control equipment broadly include” (P).Next, list the first type: “wastewater treatment plants” (Q).Finally, complete the list: “drinking water treatment plants and effluent treatment plants” (S).So the correct sequence is R → P → Q → S.Answer:Option (c) RPQS