Articleship query at snb - urgent

Hello, 

I have an urgent query. Recently I got selected for articleship at SAHANI NATRAJAN AND BAHL but they want my original certificates and I have applied to other places as well and have other interviews scheduled. 

So I am really confused about what to do? To give them my certificates and work with SNB or not and wait for how other options turn out?

PLEASE HELP I HAVE TO ANSWER THEM BY MONDAY. 

THANK YOU!