Why Does Evidence of a Prior Conviction Increase the Likelihood

Why does evidence of a prior conviction increase the likelihood of conviction on a subsequent charge?

A) It shows a pattern of criminality.
B) Once jurors know of the prior conviction, they may need less evidence to be convinced of the defendant's guilt.
C) Knowledge of a prior record may lead jurors to think that because the defendant already has a record, an erroneous conviction would not be serious-this could lead jurors to need less evidence to be convinced of a defendant's guilt.
D) All of these are correct.