question: Q:An experiment to determine the effects of gravity on blood pressure is conducted on 3 individuals of equal height and blood pressure oriented in different positions in space. Participant A is strapped in a supine position on a bed turned upside down in a vertical orientation with his head towards the floor and his feet towards the ceiling. Participant B is strapped in a supine position on a bed turned downwards in a vertical orientation with his head towards the ceiling and his feet just about touching the floor. Participant C is strapped in a supine position on a bed in a horizontal orientation. Blood pressure readings are then taken at the level of the head, heart, and feet from all 3 participants. Which of these positions will have the lowest recorded blood pressure reading?? 
  {'A': 'Participant A: at the level of the head', 'B': 'Participant B: at the level of the feet', 'C': 'Participant C: at the level of the heart', 'D': 'Participant A: at the level of the feet', 'E': 'Participant B: at the level of the head'},