Northern Ireland is well known in the United Kingdom mainly for its ______.

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．seldom works well in practice
B．usually fails to prevent an offender from committing further offenses
C．is only applicable to those offenders who commit serious driving offenses
D．may be applied to offenders who have been convicted of various types of offenses