The ________ Is a Direct Measure of the Distance from a Seismic

The ________ is a direct measure of the distance from a seismic station to the hypocentre of a distant earthquake.

A) time interval between the first P and S-wave arrivals
B) magnitude of the ground acceleration of surface wave passing a station
C) time elapsed between the first P-wave arrivals from the first and last aftershocks
D) how long before the earthquake your animals started acting agitated