Statement — Incessant rain for several days has caused overflowing and flood risk because the river bed is full of silt and mud.\nCourses of Action:\nI. Shift people residing near the river to safer places.\nII. Warn people immediately through radio/television about the danger.\nIII. Clear silt and mud from the river bed immediately after water level recedes.

Introduction / Context:
With imminent flood risk due to silted river beds, immediate life-safety and communication measures are essential, followed by medium-term mitigation (desilting).

Given Data / Assumptions:

• I: Evacuate vulnerable populations.
• II: Issue mass alerts via radio/TV.
• III: Desilt post-flood to restore capacity.

Concept / Approach:
Evacuation and alerts reduce casualties; desilting increases carrying capacity and reduces future risk.

Step-by-Step Solution:
1) Trigger staged evacuation.2) Broadcast warnings and safety guidance.3) Plan desilting after water recedes, with environmental safeguards.

Verification / Alternative check:
Disaster protocols support all three actions.

Why Other Options Are Wrong:
Partial choices ignore either immediate safety or future prevention.

Final Answer:
All follow.