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