A 74-year-old woman presents with an 18-month history of progressive short-term memory loss and difficulty learning new information. Vital signs are stable (BP 138/82, HR 72, RR 16, Temp 37°C, SpO2 98%). MRI demonstrates diffuse cortical atrophy predominantly affecting temporal and parietal lobes with preserved hippocampal volume. Mini-Cog score is 2/3. She denies visual hallucinations or parkinsonism. Which of the following is the most likely diagnosis?

1. A)Wernicke-Korsakoff syndrome
2. B)Alzheimer diseaseGABARITO
3. C)Frontotemporal dementia
4. D)Lewy body dementia
5. E)Normal pressure hydrocephalus