According to the Text,which of the Following Is a Reason

According to the text,which of the following is a reason for researchers to study disabilities in later life?

A) An increase in the number of healthy seniors will decrease the cost of resources that the healthcare system will need to provide.
B) Older people who cope with their disabilities can help researchers learn how to rehabilitate disabled seniors.
C) Increased drug use can help prevent or reverse disabilities.
D) Healthy aging can reverse the process of physical decline.