Statement: Water levels in all lakes supplying the city have dropped significantly.\nCourses of Action:\nI. Impose partial cuts/rationing in municipal supply to manage scarcity.\nII. Appeal through mass media for minimal, responsible water use by residents.

Introduction / Context:
Falling reservoir levels call for demand management and public cooperation to avoid severe shortages.

Given Data / Assumptions:

• Drop is citywide across sources.
• Short-term inflows are uncertain.
• Authorities can ration and run awareness drives.

Concept / Approach:
I smooths consumption to extend available stock; II mobilises citizen conservation (fix leaks, reuse greywater, reduce non-essential uses).

Step-by-Step Solution:
1) Implement equitable rationing schedules and tanker support for low-pressure areas.2) Launch conservation campaign; incentivise low-flow fixtures.3) Parallel supply augmentation (borewell regulation, treated wastewater for non-potable needs).

Verification / Alternative check:
Combined measures reduce demand and stretch supply until recharge.

Why Other Options Are Wrong:
Only I/Only II/Either: weaker than coordinated action; Neither: ignores the crisis.

Common Pitfalls:
Inequitable cuts; poor tanker scheduling.

Final Answer:
Both I and II follow.