Rose, who is 89 years old, has had a gradual loss of memory in her daily life activities, such as remembering people's names and phone numbers. However, in her religious studies class, she makes insightful comments and understands the topic of discussion. This would suggest that Rose is experiencing ____.
A) early signs of Alzheimer's disease
B) early signs of dementia
C) normal aging
D) a mild neurocognitive disorder