The Gene Responsible for Producing Amyloid Precursor Protein (APP) Appears

The gene responsible for producing amyloid precursor protein (APP) appears to explain the development of

A) neurocognitive disorder due to Alzheimer's disease in general.
B) late onset neurocognitive disorder due to Alzheimer's disease.
C) non-Alzheimer's type of neurocognitive disorder that tends to affect unique populations, such as those with strong family history of the disorder.
D) early onset neurocognitive disorder due to Alzheimer's disease and the higher frequency of the disorder in Down Syndrome patients.