Go and inform the authority of metro for taking suitable action.
Use some means to stop the metro train immediately.
Do not worry at all because metro station has all necessary infrastructure to tackle such situations.
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The Correct Option isD
Solution and Explanation
The correct response would be option 4 as it reflects a level of confidence that the metro station's infrastructure is capable of handling such emergencies. The other responses overestimate the need for immediate action when the situation is already under control.