This current causes earth quakes that makes a river,pond,or a lake
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I think the correct answer from the choices listed above is the last option. It is through radiation that energy can travel through empty space. It is only through the radiation type of heat transfer that any medium is not needed for transfer. It can transfer in a vacuum. Hope this answers the question.
To solve this problem we must rely on the equations of the simple harmonic movement that define the period as a function of length and gravity as

Where
l = Length
g = Gravity
Re-arrange to find L,

Our values are given as


Replacing,



Therefore the height would be 25.348m
That would be the epicenter.