Why is it important to discover alzheimer's in the very early or pre-clinical years or at least during stage me

Some scientists believe that Alzheimer’s is often overlooked or under reported as the primary cause of death on state death certificates. The disease was listed as the sixth leading cause of death in the United States in 2013, according to the most recent data compiled by the Centers for Disease Control and Prevention. However, some studies suggest that Alzheimer’s may actually be the third leading cause of death, after heart disease and cancer.

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i think the answer is d.