Concept:The correct sequence follows a logical cause-and-effect chain from immediate reaction to broader impacts. Explanation:First, people react by running to shelters (P). Then, water collects on roads (Q). Next, traffic slows due to waterlogging (R). Finally, many open umbrellas (S). This order creates a coherent paragraph from “It started raining” to “It was a heavy shower.” Answer:Option C (PQRS)