Eating turmeric, a spice commonly found in curries, probably helps prevent Alzheimer' s disease. More turmeric is consumed per capita in India than in the rest of the world, and the incidence of Alzheimer' s disease is much lower there than it is worldwide. Furthermore, Alzheimer' s disease is characterized by the buildup of amyloid protein plaques in the brain, and studies on animals found that curcumin -- a compound found in turmeric -- reduces the accumulation of amyloid proteins. Which one of the following. if true, most strengthens the argument? ["The parts of India that have the highest per capita rates of cuny consumption have the lowest incidence of Alzheimer's disease.", 'None of the other compounds found in turmeric have been studied to see whether they affect the accumulation of amyloid proteins.', "The proportion of people living in India who fall within the age group that is most prone to developing Alzheimer's disease is smaller than the proportion of people worldwide who fall within that age group.", "Many scientists believe that the buildup of amyloid protein plaques in the brain is a symptom of Alzheimer's disease rather than a cause."]