The correct answer is 3. These are the classic findings with an ACA infarct of the dominant hemisphere.
The dominant hemisphere is typically the left hemisphere in right-handed individuals and the right hemisphere in left-handed individuals.
The ACA supplies blood to the frontal and parietal lobes, which are important for movement, sensation, language, and executive functions.
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Mark - first of all this is not an answer to the SCI question; also I don't feel like any answers are correct but guess you intend the answer to be a central cord syndrome (LEs would be better than arms but in no way normal)
Well spotted! May have had an infarct myself that day...