The expression "get across to children" in the last paragraph probably means______.

A．make way for
B．give power to
C．write an order for
D．make it possible for

A．In the past, bones might be used to decide why people fell ill.
B．In pre-industrial societies priests sometimes treated patients by singing.
C．Modern medicine is so complicated that sociology no longer has a place in it.
D．There were only two roles in an elementary medical system, the patient and the one who tried to cure him.