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value 7 is placed in register pair B

every time value is reduced by one by DCX B

contens of B are moved to Accumaulator

and logical OR is performed with C

 but that do dont affect the repetion of loop which is controlled by JNZ (jump is not zero) LOP  instruction so loop executes for B values 7,6,5,4,3,2,1 total 7 times 

Hence ans is B

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