Cloze) it? '' it has been suggested that they are responding to the

Question

 متن در مورد توانایی حیوانات در مورد پیش بینی زلزله است. 

it has been suggested that they(منظور حیوانات)  are responding to the ‌‌P-waves. These travel through the ground about twice as fast as the S-waves that cause most severe shaking. They do not predict the earthquake itself-that has already happend- but only the possible arrival of the more destructive S-waves. 

مرجع they کدام است 

1(p - waves 

2,animals

یکمی گنگه چون هر دوشون میشه. 

Answer 1

2- Animals since in the following, it says that they can predict the possible arrival of the more destructive S-waves. Obviously, P-waves cannot predict the arrival of S-waves.