S1. In Mumbais century old system, sewage is collected from homes and factories and piped to various small pumping stations.
P. The sewage also pollutes beaches and coastal areas.
Q. From there it is dumped into nearby streams and creeks.
R. People living near these creeks have to live with foul smells and in unhygienic conditions.
S4. Under the new system, a 3.7 kilometre outfall tunnel will carry treated filtered sewage far out to sea.

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Solution

The correct option is C QR
Sentence P does not make much sense in the context of S1 and S4. Q and R (in this order) provide more coherence and meaning in the given context and perfectly link S1 and S4:
S1. In Mumbai's century old system, sewage is collected from homes and factories and piped to various small pumping stations. [Q] From there it is dumped into nearby streams and creeks. [R] People living near these creeks have to live with foul smells and in unhygienic conditions. S4. Under the new system, a 3.7 kilometre outfall tunnel will carry treated filtered sewage far out to sea.

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