19. According to paragraph 3, which of the following statements is true? (A) Mindfulness increases self-regulation, and enhancing self-regulation helps health behavior change. (B) People can practice meditation by resting in a comfortable chair and observing a ball being thrown upward. (C) Cognitive awareness and emotions are made possible by mindfulness, and mindfulness heightens emotional distraction. (D) Many studies showed that increased cognitive mistakes were positively related to a person’s higher level of mindfulness.