Ivan's Bank Assigned Him a Personal Identification Number (PIN)of 8624

Multiple Choice

Ivan's bank assigned him a personal identification number (PIN) of 8624 when he was first issued his credit card.Last week Ivan was issued a new PIN of 9317.If Ivan experiences proactive interference when he enters his PIN,what digits should you expect him to enter

A)  9317, his new PIN 
B)  9324, using the last two digits of his old number in error 
C)  8617, using the first two digits of his old number in error 
D)  8624, his old PIN