In Studying Alzheimer and Dementia in the Elderly, Oveisgharan and Hachinski

In studying Alzheimer and dementia in the elderly, Oveisgharan and Hachinski (2010) established that:

A) Among the elderly people with cognitive impairment but not dementia, hypertension is associated with increased likelihood of progressing to dementia.
B) Among the elderly people with cognitive impairment but not dementia, head trauma is associated with increased likelihood of progressing to dementia.
C) Among the elderly people with head trauma but not dementia, hypertension is associated with increased likelihood of progressing to dementia.
D) None of the above.