Only an expert in some branch of psychology could understand why Patrick is behaving irrationally. But no expert is certain of being able to solve someone else' s problem. Patrick wants to devise a solution to his own behavioral problem. Which one of the following conclusions can be validly drawn from the passage? ['Patrick is not certain of being able to devise a solution to his own behavioral problem.', "Unless Charles is an expert in some branch of psychology, Charles should not offer a solution to Patrick's behavioral problem.", "If Charles is certain of being able to solve Patrick's behavioral problem, then Charles does not understand why Patrick is behaving in this way.", 'Patrick is not an expert in psychology.']