Final answer:
Alzheimer's disease is a genetic, severe neurodegenerative disorder characterized by progressive neuronal death, leading to serious memory deficits and loss of basic functions.
Step-by-step explanation:
The correct answer to the student's question is c) Genetic, Severe. Alzheimer's disease (AD) is a neurodegenerative disorder with both early-onset and late-onset forms. While the early onset form is caused by mutations in specific genes and is rarer, affecting less than five percent of patients, the more common late-onset form also has a genetic component. Neurodegenerative disorders are characterized by the death of neurons in the nervous system, leading to worsening symptoms over time. Alzheimer's disease in particular leads to severe memory deficits, personality changes, and difficulty with tasks, progressing to the point where individuals may forget how to carry out basic functions like walking and talking.