The correct option is B.
United States of America is a rich country and it has the resources to take care of its elderly population, when such people have no one to take care of them; this is what led to the establishment of nursing home and retirement communities. Poor countries do not have the luxury of doing this. The elderly people often prefer such communities because of the companionship they find with other inmates. There are many retirement communities all over America and one can always find one that suit one's taste. Elderly people do not have to be sick before they are taken to retirement home.