18.According to the above paragraph, it would be MOST correct to conclude that police officers who are successful in apprehending pickpockets (A) are generally those who have had lengthy experience in recognizing all types of criminals. (B) must, by intuition, be able to recognize potential right victims. (C) must be able to predict the future actions of pickpockets using psychic abilities. (D) must have acquired specific knowledge and skills in this field.