The first paragraph is primarily about ______.

A．If an offender breaks the probation order and commits no further offense, no other penalty is imposed.
B．If an offender complies with the probation order, he will be punished merely for the original offense.
C．If an offender in the U.S. breaks the probation order, he has to serve a sentence fixed in advance.
D．If an offender in Britain breaks the probation order, he has to serve a fixed sentence for a specified period.

A．all the features that a theory has are not important
B．only accessible features of a theory are important
C．the accessible features of a theory must be very important
D．the theory about the demise of dinosaurs is false