Mary,age 82,keeps Insisting That Someone Has Been Sneaking into Her

Multiple Choice

Mary,age 82,keeps insisting that someone has been sneaking into her apartment and turning on her stove when she isn't looking.Her family has noticed that Mary has been more and more forgetful lately,and now she has begun rambling in her speech and using many word substitutions,like "horse" for "dog." Mary is likely suffering from

A) osteoarthritis.
B) negative stereotyping.
C) diabetes.
D) Alzheimer's disease.