Final answer:
Vascular dementia is a form of dementia caused by problems with blood vessels that supply the brain.
Step-by-step explanation:
The correct answer is d) Vascular dementia.
Vascular dementia is a form of dementia that is caused by problems with the blood vessels supplying the brain with oxygen and nutrients. This can be due to conditions such as stroke or cardiovascular disease, which can lead to damage in the brain.
Unlike Alzheimer's disease, which is characterized by the presence of amyloid plaques and neurofibrillary tangles in the brain, vascular dementia is associated with damage to the blood vessels themselves.