LDA 8000H,
- Above instruction transfer data from memory locatioon 8000H to Accumulator
MVI B, 30H
ADD B
- Above 2 instruction, moves 30H to Register B and add it to Accumulator. So basically the contents of Accumulator are incremented by 30H
STA 8001H
- Finally, the contents of Accumulator are stored in memory location 8001H
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None of the choices include the 'addition operation'. *Choice 3 looks to be most appropriate*.
Generally IN/OUT are used for writing to devices port (8bit addresses), so I don't think Choice 4 is the best of available answer.