Sagot :
B. II only
By studying the vibration past and present that comes from the faults.
Scientists are basing on what is the past and the present happens from the faults if the movement and vibration is change.
This statement really is true whereas scientists find out that if the fault is active by simply mapping the faults, excavating the trenches, studying the landforms by earthquakes, and other things to help them find the fault if it's active or not.
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