6. Which statement about deep breathing is true?
OA. In deep breathing, the diaphragm muscle contracts to allow more space for the lungs to fill with air.
O B. It's a way to increase tension and stress in your body.
OC. It increases the flow of oxygen to your brain, which causes your heart rate and blood pressure to increase.
O D. Deep breathing causes the muscles to become tense and decreases mental focus.
