The correct answer is option d. "It can help internal organs work properly". According to experts in fitness and physicians a good posture is essential to have optimal health and wellness. A good posture could help internal organs to work properly, because a bad posture could cause that rib cage pushes the internal organs which can resulted in breathingn problems, acid reflux, constipation or even hernias.
Their proposal specified the process by which a president could be declared "unable to discharge the powers and duties of his office", thereby making the vice president an acting president, and how the president could regain the powers of his office.
