The largest number which divides 77, 147 and 252 to leave the same remainder in each case, is _______.	
(a)	9	
(b)	15	
(c)	25	
(d)	35
The largest number which divides 77, 147 and 252 to leave the same remainder in each case, is _______.	
(a)	9	
(b)	15	
(c)	25	
(d)	35