Studies Evaluating the Effectiveness of Prochaska Et Al

Studies evaluating the effectiveness of Prochaska et al.'s (1992) transtheoretical model of behavioural change indicate that

A) interventions that teach skills relevant to action and behaviour maintenance have little effect on individual motivation.
B) interventions matched to the stage that an individual is in are more successful than those more appropriate for other stages.
C) the media has even less of an effect on an individual's health behaviours than previously thought.
D) its applications have been shown to be extremely useful.
E) its applications have shown mixed success.