question: Q:A 60-year-old male engineer who complains of shortness of breath when walking a few blocks undergoes a cardiac stress test because of concern for coronary artery disease. During the test he asks his cardiologist about what variables are usually used to quantify the functioning of the heart. He learns that one of these variables is stroke volume. Which of the following scenarios would be most likely to lead to a decrease in stroke volume?? 
  {'A': 'Anxiety', 'B': 'Exercise', 'C': 'Pregnancy', 'D': 'Heart failure', 'E': 'Digitalis'},