Question: A scientist investigated the effect of workplace stress on heart disease in humans. Men of various ages were divided into two groups based on whether they described their work as very stressful or not very stressful. During the one year investigation the scientist monitored the heart health of each man. What was the bias in this investigation?

  Options: 
 A. The investigation only lasted one year.
 B. The only organ studied was the heart.
 C. The investigation tested only men.
 D. The age of the participants varied. 
Answer: C