Assertion (A) : The location of the epicenter of an earthquake

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Assertion (A) : The location of the epicenter of an earthquake may be estimated using the time-lag between the arrival of 'P' and 'S' waves.
Reason (R) : The 'L' wave cannot start until the 'P' wave hits the surface.
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1. Both (A) and (R) are individually true and (R) is the correct explanation of (A)
2. Both (A) and (R) are individually true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. (A) is false but (R) is true

Correct Option: B

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