Option E is correct. Neurocognitive disorder due to Lewy body disease is characterized by fluctuations in mental status, prominent visual hallucinations, and extrapyramidal motor symptoms--such as rigidity, bradykinesia, and, less often, rest tremor. Option A is incorrect because the fluctuating nature of cognitive changes, which can be measured by choice reaction and vigilance reaction time tests, are more prominent in neurocognitive disorder due to Lewy body disease than in Alzheimer's disease (AD). Furthermore, extrapyramidal symptoms, when present, typically occur in later stages of AD. Option B is incorrect because neurocognitive disorder due to vascular disease is more characterized by abrupt, stepwise progression of cognitive deficits,
