Final answer:
Alzheimer's disease primarily causes symptoms like confusion and disorientation due to cognitive decline, stemming from changes like amyloid plaques and neurofibrillary tangles in the brain.
Step-by-step explanation:
Alzheimer's disease causes residents to D. be confused and disoriented. This neurodegenerative condition leads to significant cognitive decline, including disruptive memory loss, confusion about time or place, and a range of other symptoms. These symptoms are the result of molecular and cellular changes in the brain, such as the development of amyloid plaques and neurofibrillary tangles, which lead to neuron death and loss of synapses.