The prediction process that the Jungners use is essentially ______.

A．people may become aware of a previously undetected ailment
B．blood diseases can be cured very easily
C．diabetes does not respond to the apparatus
D．practically all Swedish physicians welcomed the invention

A．predict the future of medical care
B．describe a health checkup device
C．show the superior health care system of Sweden
D．warn about the dangers of undetected diseases