Statement: Drinking-water supply to New Bombay has been suspended by the Maharashtra Pollution Control Board after the Patalganga River was polluted by effluents discharged from chemical industries. Courses of Action: I. Order immediate shutdown of industries responsible for discharging effluents into the river. II. Treat river water chemically and resume supply only after quality is restored to potable standards. III. The Pollution Control Board should regularly check the nature and compliance of effluents discharged into the river by industries. Which course(s) of action logically follow(s)?

Introduction / Context:
When potable water is suspended due to industrial effluents, the response must combine enforcement, remediation, and ongoing compliance monitoring.

Given Data / Assumptions:

• Confirmed pollution from chemical industries.
• Public water supply halted for safety.
• Regulatory authority (PCB) is active.

Concept / Approach:
Logical courses are: (I) stop continued discharge from violators; (II) remediate water before resuming supply; (III) institutionalize regular monitoring and compliance checks to prevent recurrence.

Step-by-Step Solution:

Verification / Alternative check:
Water safety protocols require source control, treatment, and surveillance.

Why Other Options Are Wrong:

Common Pitfalls:
Resuming supply before verified potability; relying on one-time raids without ongoing checks.

Final Answer:
All follow.