Answer;
Seismogram C
Explanation;
In Seismogram C the time probe is placed at the beginning of the P waves because the C line doesn't start till u see the signal wave.
A seismogram is a graph output or a record written by a seismograph in response to ground motions produced by an earthquake, explosion, or other ground-motion sources.. It is a record of the ground motion at a measuring station as a function of time.
