It can be inferred that the author considers the way schizophrenia has been classified by doctors after 1960 to be an example of which of the following
A． A disease which resisted traditional methods of classification, but has been served well by modern methods of classification
B． A disease which has resisted modern methods of classification, and continues to require a traditional method of classification
C． A disease which satisfies modern methods of classification best, but which scientists prefer to classify through a traditional method
D． A disease which satisfies traditional methods of classification best, but which scientists prefer to classify through a modern method
E． A disease which may be defined equally well by modern methods of classification as by traditional ones