A. Like heart disease, dementia is an aging-related illnesses, the symptoms of which begin to appear after age 50
Incorrect, so what? This option doesn't link the evidence with the conclusion, we need to show how mental functioning can lead to decreased likelihood of dementia.
B. To gain the benefits associated with fish-oil intake, it is best to take fish-oil capsules
Incorrect, this option doesn't show how mental functioning can lead to decreased likelihood of dementia.
C. Higher levels of mental functioning are associated with a decreased likelihood of developing dementia
Correct, this directly link evidence with the conclusion.
D. Eating fish more then 4 times a week has been shown to lead to a decrease in mental functioning
Incorrect, goes against the fact given in the conclusion.
E. Fish oil has anti-inflammatory properties , which prevents Alzheimer`s-related build up of amyloid plaques in the brain
Incorrect, presents another advantage of eating fish oil but we don't know Alzheimer is related to dementia.