McGuire (1968)broke Down the Persuasion Process into Six Stages,Why Can

McGuire (1968) broke down the persuasion process into six stages,Why can one infer from this model that the likelihood of successful persuasion (i,e..behavior change) is extremely small by default?

A) Successful persuasion depends on factors such as personality and external conditions,
B) Successful persuasion depends on whether or not cognitive responses have been generated during message processing,
C) Message processing can occasionally bypass early stages,
D) As each stage has a probability of successful completion,the probability of completing all stages is very low