Find the greatest number which on dividing 3815 and 4521, leaves a reminder of 31 and 33 respectively  Choose the correct option: A) 88 B) 56 C) 89 D) 86 E) 96

Rationale: "explanation : in this type of question , its obvious we need to calculate the hcf , trick is hcf of ( 3815 - 31 ) and ( 4521 - 33 ) = hcf ( 3784 , 4488 ) = 88 option a"
Answer: A