A news reporter reads about the relationship between acetylcholine and Alzheimer's disease and comments, "So basically, Alzheimer's disease (AD) is caused by a lack of acetylcholine." How would you evaluate the reporter's statement?

a) The reporter is incorrect because the evidence links acetylcholine to memory but does not confirm causality of AD
b) The reporter is incorrect because the evidence regarding glutamate deficiency as a cause of AD is stronger than that for acetylcholine.
c) The reporter is correct but the research is still in its infancy and needs to be confirmed.
d) The reporter is correct but the finding only applies to a subtype of AD that has a strong genetic component.

A