B
Some judges complain about statutes that specify mandatory minimum sentences for criminal offenses. These legal restrictions, they complain, are too mechanical and prevent judges from deciding when a given individual can or cannot be rehabilitated. But that is precisely why mandatory minimum sentences are necessary. History amply demonstrates that when people are free to use their own judgment they invariably believe themselves to act wisely when in fact they are often arbitrary and irrational. There is no reason to think that judges are an exception to this rule. Which one of the following sentences most accurately expresses the main point of the passage?
A: Mandatory minimum sentences are too mechanical and reduce judicial discretion.
B: Mandatory minimum sentences are needed to help prevent judicial arbitrariness.
C: People believe that they have good judgment but never do.
D: Judges should be free to exercise their own judgment.