Answer:
Option b
Step-by-step explanation:
A seismograph is an instrument that is used to record earthquakes. An earthquake produces seismic waves, that seismograph can detect. It consists of a frame, base, and fixed mass.
On the contrary, seismogram is the output or the record of vibrations of the Earth, particularly earthquakes. It is a graphical representation of the seismic waves recorded by the seismograph (instrument).