Discussion
Assertion (A): Confirmation from ocean sensors is essential to avoid false alarms.
Reason (R): Most large submarine earthquakes do not in fact generate a damaging tsunami.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the necessity. Seismic data alone can tell that a large submarine earthquake has occurred but not whether it displaced the sea bed enough to generate a wave, and most large ones do not. Deep ocean pressure sensors detect the passing wave directly and confirm or cancel the warning - which matters because repeated false alarms destroy the public compliance on which evacuation depends.
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