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.Code

• A. Both (A) and (R) are individually true and (R) is the correct explanation of (A)
• B. Both (A) and (R) are individually true but (R) is not the correct explanation of (A)
• C. (A) is true but (R) is false
• D. (A) is false but (R) is true